{"id":5683,"date":"2026-08-21T11:56:33","date_gmt":"2026-08-21T03:56:33","guid":{"rendered":"https:\/\/www.tashells.com\/?p=5683"},"modified":"2026-08-21T11:59:41","modified_gmt":"2026-08-21T03:59:41","slug":"oem-earbuds-factory-quality-checklist","status":"publish","type":"post","link":"https:\/\/www.tashells.com\/ar\/oem-earbuds-factory-quality-checklist\/","title":{"rendered":"\u0642\u0627\u0626\u0645\u0629 \u0627\u0644\u062a\u062d\u0642\u0642 \u0645\u0646 \u062c\u0648\u062f\u0629 \u0633\u0645\u0627\u0639\u0627\u062a \u0627\u0644\u0623\u0630\u0646 \u0627\u0644\u0623\u0635\u0644\u064a\u0629 \u0645\u0646 \u0627\u0644\u0645\u0635\u0646\u0639"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"5683\" class=\"elementor elementor-5683\">\n\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-c38caa8 e-flex e-con-boxed e-con e-parent\" data-id=\"c38caa8\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\" data-core-v316-plus=\"true\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-9bc3fe8 elementor-widget elementor-widget-text-editor\" data-id=\"9bc3fe8\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<style>\/*! elementor - v3.17.0 - 08-11-2023 *\/\n.elementor-widget-text-editor.elementor-drop-cap-view-stacked .elementor-drop-cap{background-color:#69727d;color:#fff}.elementor-widget-text-editor.elementor-drop-cap-view-framed .elementor-drop-cap{color:#69727d;border:3px solid;background-color:transparent}.elementor-widget-text-editor:not(.elementor-drop-cap-view-default) .elementor-drop-cap{margin-top:8px}.elementor-widget-text-editor:not(.elementor-drop-cap-view-default) .elementor-drop-cap-letter{width:1em;height:1em}.elementor-widget-text-editor .elementor-drop-cap{float:left;text-align:center;line-height:1;font-size:50px}.elementor-widget-text-editor .elementor-drop-cap-letter{display:inline-block}<\/style>\t\t\t\t<h1 class=\"md-end-block md-heading\"><span class=\"md-plain\">OEM Earbuds Factory Quality Checklist<\/span><\/h1><p class=\"md-end-block md-p\"><span class=\"md-plain\">The sample pair worked perfectly. Great pairing, clean audio, solid fit. Six weeks later the 3,000-unit order lands and customer service starts fielding complaints: dead left channel, cases that stop charging at 70%, Bluetooth that drops every time someone walks past a microwave. Nothing was wrong with the sample. Something was wrong with the process that turned the sample into a production run \u2014 and usually, it&#8217;s a QC checkpoint that got skipped or never existed in the first place.<\/span><\/p><p class=\"md-end-block md-p md-focus\"><span class=\"md-plain\">This is a working <a href=\"https:\/\/www.tashells.com\/oem-earbuds\/\">OEM earbuds factory<\/a> quality checklist, not a lecture. Print it, save it as a PDF, or paste sections into your email to the factory before you send a deposit. It&#8217;s organized the way a real QC department organizes its own work: verify the factory, check incoming materials, check the product while it&#8217;s being built, then check it again before it ships.<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-b08bb32 e-flex e-con-boxed e-con e-parent\" data-id=\"b08bb32\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\" data-core-v316-plus=\"true\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-892fb5c elementor-widget elementor-widget-image\" data-id=\"892fb5c\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<style>\/*! elementor - v3.17.0 - 08-11-2023 *\/\n.elementor-widget-image{text-align:center}.elementor-widget-image a{display:inline-block}.elementor-widget-image a img[src$=\".svg\"]{width:48px}.elementor-widget-image img{vertical-align:middle;display:inline-block}<\/style>\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"1000\" height=\"562\" src=\"https:\/\/www.tashells.com\/wp-content\/uploads\/2026\/08\/qc-inspector-checking-tws-earbuds-pcb.webp\" class=\"attachment-full size-full wp-image-5685\" alt=\"OEM earbuds factory quality control inspection\" srcset=\"https:\/\/www.tashells.com\/wp-content\/uploads\/2026\/08\/qc-inspector-checking-tws-earbuds-pcb.webp 1000w, https:\/\/www.tashells.com\/wp-content\/uploads\/2026\/08\/qc-inspector-checking-tws-earbuds-pcb-300x169.webp 300w, https:\/\/www.tashells.com\/wp-content\/uploads\/2026\/08\/qc-inspector-checking-tws-earbuds-pcb-768x432.webp 768w, https:\/\/www.tashells.com\/wp-content\/uploads\/2026\/08\/qc-inspector-checking-tws-earbuds-pcb-18x10.webp 18w, https:\/\/www.tashells.com\/wp-content\/uploads\/2026\/08\/qc-inspector-checking-tws-earbuds-pcb-600x337.webp 600w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-3df92ae e-flex e-con-boxed e-con e-parent\" data-id=\"3df92ae\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\" data-core-v316-plus=\"true\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-1a0a93a elementor-widget elementor-widget-text-editor\" data-id=\"1a0a93a\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<h2 class=\"md-end-block md-heading\"><span class=\"md-plain\">Why a Written Checklist Beats a Verbal Promise<\/span><\/h2><p class=\"md-end-block md-p\"><span class=\"md-plain\">Every factory says &#8220;we have strict QC.&#8221; That sentence costs nothing to say and tells you nothing about what actually happens on the line. A checklist forces specifics: which stage catches which defect, what the acceptance threshold is, and who signs off. If a supplier can&#8217;t answer a specific line item on this list, or answers with &#8220;don&#8217;t worry, we&#8217;re very professional,&#8221; treat that as data, not reassurance.<\/span><\/p><p class=\"md-end-block md-p\"><span class=\"md-plain\">Send this list to a candidate factory before you commit. Their response \u2014 detailed and specific versus vague and reassuring \u2014 tells you more about how they&#8217;ll handle your production run than their sample quality ever will. It pairs well with a broader <\/span><span class=\"md-meta-i-c  md-link\"><a href=\"https:\/\/www.tashells.com\/questions-to-ask-earbuds-supplier\/\"><span class=\"md-plain\">supplier verification checklist<\/span><\/a><\/span><span class=\"md-plain\"> if you&#8217;re still confirming the company itself is a real manufacturer and not a reselling trading company.<\/span><\/p><h2 class=\"md-end-block md-heading\"><span class=\"md-plain\">Stage 1: Factory Verification Checklist<\/span><\/h2><p class=\"md-end-block md-p\"><span class=\"md-plain\">Before any QC conversation matters, confirm you&#8217;re actually talking to the people who build the product.<\/span><\/p><ul class=\"ul-list\" data-mark=\"-\"><li class=\"md-list-item task-list-item  md-task-list-item task-list-not-done \"><input type=\"checkbox\" \/> <span class=\"md-plain\">Business license name matches the name on the contract, invoice, and bank account<\/span><\/li><li class=\"md-list-item task-list-item  md-task-list-item task-list-not-done \"><input type=\"checkbox\" \/> <span class=\"md-plain\">Company registration cross-checked against <\/span><span class=\"md-meta-i-c  md-link\"><a href=\"https:\/\/www.gsxt.gov.cn\/\"><span class=\"md-plain\">China&#8217;s National Enterprise Credit Information Publicity System<\/span><\/a><\/span><\/li><li class=\"md-list-item task-list-item  md-task-list-item task-list-not-done \"><input type=\"checkbox\" \/> <span class=\"md-plain\">Factory can arrange a live, unscripted video walkthrough of the SMT line and assembly floor \u2014 not pre-recorded footage<\/span><\/li><li class=\"md-list-item task-list-item  md-task-list-item task-list-not-done \"><input type=\"checkbox\" \/> <span class=\"md-plain\">Production photos or video show your actual product on the line, not a generic promotional reel<\/span><\/li><li class=\"md-list-item task-list-item  md-task-list-item task-list-not-done \"><input type=\"checkbox\" \/> <span class=\"md-plain\">Factory states plainly whether they are the manufacturer or a trading company reselling another factory&#8217;s output<\/span><\/li><\/ul><p class=\"md-end-block md-p\"><span class=\"md-plain\">If more than one of these comes back vague, stop here \u2014 our guide on <\/span><span class=\"md-meta-i-c  md-link\"><a href=\"https:\/\/www.tashells.com\/how-to-avoid-low-quality-earbuds-supplier\/\"><span class=\"md-plain\">spotting a low quality earbuds supplier<\/span><\/a><\/span><span class=\"md-plain\"> covers the red flags in more depth before you move further into QC specifics.<\/span><\/p><h2 class=\"md-end-block md-heading\"><span class=\"md-plain\">Stage 2: Incoming Quality Control (IQC) Checklist<\/span><\/h2><p class=\"md-end-block md-p\"><span class=\"md-plain\">IQC happens before a single unit is assembled. This is where bad batteries, mismatched drivers, or off-spec housings get caught before they become 3,000 defective earbuds instead of one rejected carton of components.<\/span><\/p><ul class=\"ul-list\" data-mark=\"-\"><li class=\"md-list-item task-list-item  md-task-list-item task-list-not-done \"><input type=\"checkbox\" \/> <span class=\"md-plain\">Lithium battery cells inspected for capacity, voltage, and physical defects on arrival<\/span><\/li><li class=\"md-list-item task-list-item  md-task-list-item task-list-not-done \"><input type=\"checkbox\" \/> <span class=\"md-plain\">Bluetooth chipset (Qualcomm QCC, Airoha, BES, or Jieli, depending on your platform) verified against the agreed BOM \u2014 not a substitute chip<\/span><\/li><li class=\"md-list-item task-list-item  md-task-list-item task-list-not-done \"><input type=\"checkbox\" \/> <span class=\"md-plain\">Speaker drivers and microphones sample-tested for output and sensitivity before assembly<\/span><\/li><li class=\"md-list-item task-list-item  md-task-list-item task-list-not-done \"><input type=\"checkbox\" \/> <span class=\"md-plain\">ABS\/PC housing and silicone ear tips checked for color match, dimensional accuracy, and surface defects<\/span><\/li><li class=\"md-list-item task-list-item  md-task-list-item task-list-not-done \"><input type=\"checkbox\" \/> <span class=\"md-plain\">PCB boards inspected for soldering quality and component placement<\/span><\/li><li class=\"md-list-item task-list-item md-task-list-item task-list-not-done md-focus-container\"><input type=\"checkbox\" \/> <span class=\"md-plain\">Rejected material batches are documented, not silently reworked into the line<\/span><\/li><\/ul>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-4a732d6 e-flex e-con-boxed e-con e-parent\" data-id=\"4a732d6\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\" data-core-v316-plus=\"true\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-cf4e4da elementor-widget elementor-widget-text-editor\" data-id=\"cf4e4da\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<h2 class=\"md-end-block md-heading\"><span class=\"md-plain\">Stage 3: In-Process QC (DUPRO \/ IPQC) Checklist<\/span><\/h2><p class=\"md-end-block md-p\"><span class=\"md-plain\">DUPRO \u2014 during-production inspection \u2014 catches problems while the line is running, instead of discovering them after 3,000 units are already boxed.<\/span><\/p><ul class=\"ul-list\" data-mark=\"-\"><li class=\"md-list-item task-list-item md-task-list-item task-list-not-done \"><input type=\"checkbox\" \/> <span class=\"md-plain\">QC staff stationed at the line, not only at final inspection<\/span><\/li><li class=\"md-list-item task-list-item md-task-list-item task-list-not-done \"><input type=\"checkbox\" \/> <span class=\"md-plain\">Each sub-assembly stage (PCB soldering, speaker mounting, battery placement, housing assembly) has a defined pass\/fail checkpoint<\/span><\/li><li class=\"md-list-item task-list-item md-task-list-item task-list-not-done \"><input type=\"checkbox\" \/> <span class=\"md-plain\">Random units pulled mid-run and function-tested, not just visually checked<\/span><\/li><li class=\"md-list-item task-list-item md-task-list-item task-list-not-done \"><input type=\"checkbox\" \/> <span class=\"md-plain\">Line stops and corrects when defect rate at any checkpoint exceeds the agreed threshold, rather than continuing to run<\/span><\/li><li class=\"md-list-item task-list-item md-task-list-item task-list-not-done \"><input type=\"checkbox\" \/> <span class=\"md-plain\">Touch control calibration verified for consistency between left and right earbuds<\/span><\/li><\/ul><h2 class=\"md-end-block md-heading\"><span class=\"md-plain\">Stage 4: Final Quality Control (FQC) Checklist<\/span><\/h2><p class=\"md-end-block md-p\"><span class=\"md-plain\">This is the last checkpoint before packing. It should test the finished product the way your customer will actually use it \u2014 not just whether it powers on. If you want the technical detail behind these tests \u2014 deviation windows, comparative benchmarks, what &#8220;passing&#8221; actually means \u2014 our <\/span><span class=\"md-meta-i-c md-link\"><a href=\"https:\/\/www.tashells.com\/earbuds-quality-testing-guide\/\"><span class=\"md-plain\">earbuds quality testing guide<\/span><\/a><\/span><span class=\"md-plain\"> breaks each one down.<\/span><\/p><p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">Connectivity and pairing<\/span><\/strong><\/span><\/p><ul class=\"ul-list\" data-mark=\"-\"><li class=\"md-list-item task-list-item md-task-list-item task-list-not-done \"><input type=\"checkbox\" \/> <span class=\"md-plain\">Pairing tested on both iOS and Android devices<\/span><\/li><li class=\"md-list-item task-list-item md-task-list-item task-list-not-done \"><input type=\"checkbox\" \/> <span class=\"md-plain\">Bluetooth range tested at realistic distance (10\u201315 meters, through at least one wall)<\/span><\/li><li class=\"md-list-item task-list-item md-task-list-item task-list-not-done \"><input type=\"checkbox\" \/> <span class=\"md-plain\">Reconnection speed tested after the case is closed and reopened<\/span><\/li><li class=\"md-list-item task-list-item md-task-list-item task-list-not-done \"><input type=\"checkbox\" \/> <span class=\"md-plain\">Multipoint connection tested if the spec includes it<\/span><\/li><\/ul><p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">Audio and call quality<\/span><\/strong><\/span><\/p><ul class=\"ul-list\" data-mark=\"-\"><li class=\"md-list-item task-list-item md-task-list-item task-list-not-done \"><input type=\"checkbox\" \/> <span class=\"md-plain\">Left\/right channel volume and tonal balance checked against an acceptable deviation window<\/span><\/li><li class=\"md-list-item task-list-item md-task-list-item task-list-not-done \"><input type=\"checkbox\" \/> <span class=\"md-plain\">Playback tested for distortion or unwanted noise at normal and maximum volume<\/span><\/li><li class=\"md-list-item task-list-item md-task-list-item task-list-not-done \"><input type=\"checkbox\" \/> <span class=\"md-plain\">Microphone clarity tested for calls, including ENC performance if the SKU includes it<\/span><\/li><li class=\"md-list-item task-list-item md-task-list-item task-list-not-done \"><input type=\"checkbox\" \/> <span class=\"md-plain\">ANC effectiveness verified against spec if applicable<\/span><\/li><\/ul><p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">Battery<\/span><\/strong><\/span><\/p><ul class=\"ul-list\" data-mark=\"-\"><li class=\"md-list-item task-list-item md-task-list-item task-list-not-done \"><input type=\"checkbox\" \/> <span class=\"md-plain\">Continuous playback tested at realistic volume until depletion, compared against the claimed runtime \u2014 not tested at minimum volume, which inflates the number<\/span><\/li><li class=\"md-list-item task-list-item md-task-list-item task-list-not-done \"><input type=\"checkbox\" \/> <span class=\"md-plain\">Charging case tested for full charge cycles, not a single top-up<\/span><\/li><li class=\"md-list-item task-list-item md-task-list-item task-list-not-done md-focus-container\"><input type=\"checkbox\" \/> <span class=\"md-plain\">Charging contacts checked for consistent connection across units<\/span><\/li><\/ul>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-a1fd5a8 e-flex e-con-boxed e-con e-parent\" data-id=\"a1fd5a8\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\" data-core-v316-plus=\"true\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-998515d elementor-widget elementor-widget-text-editor\" data-id=\"998515d\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">Build and function<\/span><\/strong><\/span><\/p><ul class=\"ul-list\" data-mark=\"-\"><li class=\"md-list-item task-list-item  md-task-list-item task-list-not-done \"><input type=\"checkbox\" \/> <span class=\"md-plain\">Touch controls tested for every mapped function, both earbuds<\/span><\/li><li class=\"md-list-item task-list-item  md-task-list-item task-list-not-done \"><input type=\"checkbox\" \/> <span class=\"md-plain\">Voice prompts tested if included<\/span><\/li><li class=\"md-list-item task-list-item  md-task-list-item task-list-not-done \"><input type=\"checkbox\" \/> <span class=\"md-plain\">IPX rating verified against certification, if the product claims water or sweat resistance<\/span><\/li><li class=\"md-list-item task-list-item  md-task-list-item task-list-not-done \"><input type=\"checkbox\" \/> <span class=\"md-plain\">Aging test run \u2014 units powered on for several continuous hours to surface intermittent failures that a five-minute test won&#8217;t catch<\/span><\/li><li class=\"md-list-item task-list-item  md-task-list-item task-list-not-done \"><input type=\"checkbox\" \/> <span class=\"md-plain\">Cosmetic inspection for scratches, color mismatch, and case fit<\/span><\/li><\/ul><p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">Packaging and outgoing checks<\/span><\/strong><\/span><\/p><ul class=\"ul-list\" data-mark=\"-\"><li class=\"md-list-item task-list-item  md-task-list-item task-list-not-done \"><input type=\"checkbox\" \/> <span class=\"md-plain\">Packaging matches approved artwork and box specs<\/span><\/li><li class=\"md-list-item task-list-item  md-task-list-item task-list-not-done \"><input type=\"checkbox\" \/> <span class=\"md-plain\">Accessories (charging cable, manual, extra ear tips) present and correct<\/span><\/li><li class=\"md-list-item task-list-item  md-task-list-item task-list-not-done \"><input type=\"checkbox\" \/> <span class=\"md-plain\">Carton quantity and weight verified against the packing list<\/span><\/li><li class=\"md-list-item task-list-item  md-task-list-item task-list-not-done \"><input type=\"checkbox\" \/> <span class=\"md-plain\">Random cartons opened and cross-checked against the FQC report before loading<\/span><\/li><\/ul><h2 class=\"md-end-block md-heading\"><span class=\"md-plain\">Documentation and Certification Checklist<\/span><\/h2><p class=\"md-end-block md-p\"><span class=\"md-plain\">A factory that passes every technical checkpoint above but can&#8217;t produce matching paperwork isn&#8217;t ready to ship to your market.<\/span><\/p><ul class=\"ul-list\" data-mark=\"-\"><li class=\"md-list-item task-list-item  md-task-list-item task-list-not-done \"><input type=\"checkbox\" \/> <span class=\"md-meta-i-c  md-link\"><a href=\"https:\/\/www.fcc.gov\/oet\/ea\/fccid\"><span class=\"md-plain\">FCC ID and test report<\/span><\/a><\/span><span class=\"md-plain\"> (US market)<\/span><\/li><li class=\"md-list-item task-list-item  md-task-list-item task-list-not-done \"><input type=\"checkbox\" \/> <span class=\"md-plain\">CE and RoHS documentation (EU market)<\/span><\/li><li class=\"md-list-item task-list-item  md-task-list-item task-list-not-done \"><input type=\"checkbox\" \/> <span class=\"md-plain\">UKCA documentation (UK market)<\/span><\/li><li class=\"md-list-item task-list-item  md-task-list-item task-list-not-done \"><input type=\"checkbox\" \/> <span class=\"md-meta-i-c  md-link\"><a href=\"https:\/\/www.bluetooth.com\/develop-with-bluetooth\/qualification-listing\/\"><span class=\"md-plain\">BQB (Bluetooth SIG qualification)<\/span><\/a><\/span><span class=\"md-plain\"> listing matches your specific model<\/span><\/li><li class=\"md-list-item task-list-item  md-task-list-item task-list-not-done \"><input type=\"checkbox\" \/> <span class=\"md-plain\">UN38.3 test report for lithium battery air freight<\/span><\/li><li class=\"md-list-item task-list-item  md-task-list-item task-list-not-done \"><input type=\"checkbox\" \/> <span class=\"md-plain\">Certificate numbers match your exact product model and production batch \u2014 not a generic certificate reused across the factory&#8217;s catalog<\/span><\/li><li class=\"md-list-item task-list-item  md-task-list-item task-list-not-done \"><input type=\"checkbox\" \/> <span class=\"md-plain\">Batch-dated test reports available covering acoustic, RF, and battery testing, plus IQC, DUPRO, and FQC inspection records<\/span><\/li><\/ul><h2 class=\"md-end-block md-heading\"><span class=\"md-plain\">What AQL Standard to Require<\/span><\/h2><p class=\"md-end-block md-p\"><span class=\"md-plain\">AQL \u2014 Acceptable Quality Limit \u2014 sets how many defective units in a sample are acceptable before the whole batch is rejected. Don&#8217;t leave this as a verbal understanding; write it into the purchase agreement.<\/span><\/p><figure class=\"md-table-fig\"><table class=\"md-table\"><thead><tr class=\"md-end-block\"><th><span class=\"td-span\"><span class=\"md-plain\">Defect Class<\/span><\/span><\/th><th><span class=\"td-span\"><span class=\"md-plain\">Typical AQL<\/span><\/span><\/th><th><span class=\"td-span\"><span class=\"md-plain\">What It Covers<\/span><\/span><\/th><\/tr><\/thead><tbody><tr class=\"md-end-block\"><td><span class=\"td-span\"><span class=\"md-plain\">Critical<\/span><\/span><\/td><td><span class=\"td-span\"><span class=\"md-plain\">0<\/span><\/span><\/td><td><span class=\"td-span\"><span class=\"md-plain\">Safety hazards \u2014 battery, fire risk, electrical shock<\/span><\/span><\/td><\/tr><tr class=\"md-end-block\"><td><span class=\"td-span\"><span class=\"md-plain\">Major<\/span><\/span><\/td><td><span class=\"td-span\"><span class=\"md-plain\">1.0\u20131.5<\/span><\/span><\/td><td><span class=\"td-span\"><span class=\"md-plain\">Functional failures \u2014 no pairing, dead unit, no sound<\/span><\/span><\/td><\/tr><tr class=\"md-end-block\"><td><span class=\"td-span\"><span class=\"md-plain\">Minor<\/span><\/span><\/td><td><span class=\"td-span\"><span class=\"md-plain\">2.5\u20134.0<\/span><\/span><\/td><td><span class=\"td-span\"><span class=\"md-plain\">Cosmetic issues \u2014 scuffs, color variance, minor fit issues<\/span><\/span><\/td><\/tr><\/tbody><\/table><\/figure><p class=\"md-end-block md-p md-focus\"><span class=\"md-plain\">If your factory quotes a single blended AQL number without breaking out defect classes, ask them to separate it. A 2.5 AQL sounds fine until you realize it&#8217;s being applied to battery safety defects instead of scratches.<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-7f1e858 e-flex e-con-boxed e-con e-parent\" data-id=\"7f1e858\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\" data-core-v316-plus=\"true\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-dd01d3b elementor-widget elementor-widget-text-editor\" data-id=\"dd01d3b\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<h2 class=\"md-end-block md-heading\"><span class=\"md-plain\">Using This Checklist on a Video Audit or Factory Visit<\/span><\/h2><p class=\"md-end-block md-p\"><span class=\"md-plain\">You don&#8217;t need to be in Dongguan to run this list. On a live video call, ask the factory to walk the camera through each stage in order: incoming material storage, the SMT line, the DUPRO checkpoints, and the FQC bench, in that sequence. A factory that hesitates to show any single stage, or redirects to a different room, is telling you something about that stage specifically.<\/span><\/p><p class=\"md-end-block md-p\"><span class=\"md-plain\">If you&#8217;re placing a first order above a small test batch, a third-party inspection (Bureau Veritas, SGS, QIMA, or similar) run against this same checklist at the pre-shipment stage is worth the few hundred dollars it costs. It&#8217;s an independent check on everything above, not a replacement for it.<\/span><\/p><h2 class=\"md-end-block md-heading\"><span class=\"md-plain\">Where a Factory Should Meet You Halfway<\/span><\/h2><p class=\"md-end-block md-p\"><span class=\"md-plain\">Tashells Audio runs OEM and ODM production for TWS, ANC, and open-ear earbuds out of our own facility in Fenggang, Dongguan, and this list is close to the internal checklist our own QC team works from \u2014 IQC on batteries, chipsets, and drivers before assembly, DUPRO checkpoints through the SMT and assembly line, and FQC covering connectivity, audio, battery runtime, and aging tests before anything gets packed.<\/span><\/p><p class=\"md-end-block md-p md-focus\"><span class=\"md-plain\">We share current FCC, CE, RoHS, UN38.3, and BQB documentation before a deposit is discussed, and we&#8217;re comfortable with buyers bringing in a third-party inspector at any stage \u2014 that&#8217;s a normal part of how the process works, not an exception. If you want to see how this quality checklist maps onto our own <\/span><span class=\"md-meta-i-c  md-link\"><a href=\"https:\/\/www.tashells.com\/2026\/04\/23\/quality-control-process-for-bluetooth-earbuds\/\"><span class=\"md-plain\">QC process<\/span><\/a><\/span><span class=\"md-plain\"> or run it directly against us, our <\/span><span class=\"md-meta-i-c  md-link\"><a href=\"https:\/\/www.tashells.com\/oem-odm-service\/\"><span class=\"md-plain\">OEM &amp; ODM service page<\/span><\/a><\/span><span class=\"md-plain\"> has the details.<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-106f6ad e-flex e-con-boxed e-con e-parent\" data-id=\"106f6ad\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\" data-core-v316-plus=\"true\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-a7f40fe elementor-widget elementor-widget-text-editor\" data-id=\"a7f40fe\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<h2 class=\"md-end-block md-heading\"><span class=\"md-plain\">FAQ<\/span><\/h2><p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">What&#8217;s the difference between IQC, DUPRO, and FQC?<\/span><\/strong><\/span> <span class=\"md-plain\">IQC (incoming quality control) checks raw materials and components before assembly. DUPRO (during-production inspection, also called IPQC) checks the product at defined points while it&#8217;s being built. FQC (final quality control) is the last check on finished units before packing and shipment. A factory that only performs FQC and skips the first two is catching defects too late to fix efficiently.<\/span><\/p><p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">What AQL level should I require for an earbuds inspection?<\/span><\/strong><\/span> <span class=\"md-plain\">Most buyers use AQL 0 for critical safety defects, AQL 1.0\u20131.5 for major functional defects like dead units or pairing failures, and AQL 2.5\u20134.0 for minor cosmetic issues. Write these into your purchase agreement rather than accepting a single blended number.<\/span><\/p><p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">Should I trust the factory&#8217;s own QC, or hire a third-party inspector?<\/span><\/strong><\/span> <span class=\"md-plain\">For a small test batch, the factory&#8217;s own reports plus a live video audit are usually enough. For any order beyond that, a third-party inspection at the pre-shipment stage is a reasonable added cost \u2014 it checks the factory&#8217;s own numbers rather than replacing the need for them.<\/span><\/p><p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">What documents should a factory provide to prove their QC claims?<\/span><\/strong><\/span> <span class=\"md-plain\">Batch-dated test reports covering acoustic, RF, and battery performance, along with IQC, DUPRO, and FQC inspection records, and certificates (FCC, CE, RoHS, UN38.3, BQB) that match your specific model and production batch \u2014 not generic documents reused across the factory&#8217;s catalog.<\/span><\/p><p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">Does this checklist apply the same way to ANC and <a href=\"https:\/\/www.tashells.com\/product-category\/open-ear-earbuds-manufacturer\/\">open-ear earbuds<\/a>?<\/span><\/strong><\/span> <span class=\"md-plain\">The stages are the same, but FQC should test the features specific to your SKU \u2014 ANC effectiveness against spec for ANC models, IPX rating verification for sport-focused open-ear models, and ENC call clarity for anything marketed on call quality.<\/span><\/p><h2 class=\"md-end-block md-heading\"><span class=\"md-plain\">Before You Send a Deposit<\/span><\/h2><p class=\"md-end-block md-p md-focus\"><span class=\"md-plain\">A checklist only works if you actually run it before money changes hands, not after the first bad batch arrives. Send this list to any factory you&#8217;re evaluating and see how specifically they respond. If you&#8217;d like to run it directly against Tashells Audio, reach out with your target specs and we&#8217;ll walk through our QC process, documentation, and a live video tour of the floor before you commit to anything.<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-c83199d e-flex e-con-boxed e-con e-parent\" data-id=\"c83199d\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\" data-core-v316-plus=\"true\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f6ac67f elementor-widget elementor-widget-wpforms\" data-id=\"f6ac67f\" data-element_type=\"widget\" data-widget_type=\"wpforms.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<div class=\"wpforms-container wpforms-container-full wpforms-render-modern\" id=\"wpforms-178\"><form id=\"wpforms-form-178\" class=\"wpforms-validate wpforms-form wpforms-ajax-form\" data-formid=\"178\" method=\"post\" enctype=\"multipart\/form-data\" action=\"\/ar\/wp-json\/wp\/v2\/posts\/5683\" data-token=\"430e51f2621e93fb2097b7d062d8fb18\" data-token-time=\"1787570739\"><noscript class=\"wpforms-error-noscript\">Please enable JavaScript in your browser to complete this form.<\/noscript><div id=\"wpforms-error-noscript\" style=\"display: none;\">Please enable JavaScript in your browser to complete this form.<\/div><div class=\"wpforms-field-container\"><div id=\"wpforms-178-field_0-container\" class=\"wpforms-field wpforms-field-name\" data-field-id=\"0\"><label class=\"wpforms-field-label\" for=\"wpforms-178-field_0\">*Name <span class=\"wpforms-required-label\" aria-hidden=\"true\">*<\/span><\/label><input type=\"text\" id=\"wpforms-178-field_0\" class=\"wpforms-field-medium wpforms-field-required\" name=\"wpforms[fields][0]\" aria-errormessage=\"wpforms-178-field_0-error\" required><\/div><div id=\"wpforms-178-field_1-container\" class=\"wpforms-field wpforms-field-email\" data-field-id=\"1\"><label class=\"wpforms-field-label\" for=\"wpforms-178-field_1\">*Email(We will reply you via email in 24 hours) <span class=\"wpforms-required-label\" aria-hidden=\"true\">*<\/span><\/label><input type=\"email\" id=\"wpforms-178-field_1\" class=\"wpforms-field-medium wpforms-field-required\" name=\"wpforms[fields][1]\" spellcheck=\"false\" aria-errormessage=\"wpforms-178-field_1-error\" required><\/div><div id=\"wpforms-178-field_3-container\" class=\"wpforms-field wpforms-field-text\" data-field-id=\"3\"><label class=\"wpforms-field-label\" for=\"wpforms-178-field_3\">Phone\/WhatsApp\/WeChat(Very important)<\/label><input type=\"text\" id=\"wpforms-178-field_3\" class=\"wpforms-field-medium\" name=\"wpforms[fields][3]\" aria-errormessage=\"wpforms-178-field_3-error\" ><\/div><div id=\"wpforms-178-field_2-container\" class=\"wpforms-field wpforms-field-textarea\" data-field-id=\"2\"><label class=\"wpforms-field-label\" for=\"wpforms-178-field_2\">*Enter product details such as model, color, materials etc. and other specific requirements to receive an accurate quote.<\/label><textarea id=\"wpforms-178-field_2\" class=\"wpforms-field-medium\" name=\"wpforms[fields][2]\" aria-errormessage=\"wpforms-178-field_2-error\" ><\/textarea><\/div><\/div><!-- .wpforms-field-container --><div class=\"wpforms-recaptcha-container wpforms-is-recaptcha wpforms-is-recaptcha-type-v2\" ><div class=\"g-recaptcha\" data-sitekey=\"6LcwpyMpAAAAAJRWcB_WdfQodkoDcUQv70yIYK-j\"><\/div><input type=\"text\" name=\"g-recaptcha-hidden\" class=\"wpforms-recaptcha-hidden\" style=\"position:absolute!important;clip:rect(0,0,0,0)!important;height:1px!important;width:1px!important;border:0!important;overflow:hidden!important;padding:0!important;margin:0!important;\" data-rule-recaptcha=\"1\"><\/div><div class=\"wpforms-submit-container\" ><input type=\"hidden\" name=\"wpforms[id]\" value=\"178\"><input type=\"hidden\" name=\"page_title\" value=\"\"><input type=\"hidden\" name=\"page_url\" value=\"https:\/\/www.tashells.com\/ar\/wp-json\/wp\/v2\/posts\/5683\"><input type=\"hidden\" name=\"url_referer\" value=\"\"><button type=\"submit\" name=\"wpforms[submit]\" id=\"wpforms-submit-178\" class=\"wpforms-submit\" data-alt-text=\"Send...\" data-submit-text=\"Send\" aria-live=\"assertive\" value=\"wpforms-submit\">Send<\/button><img decoding=\"async\" src=\"https:\/\/www.tashells.com\/wp-content\/plugins\/wpforms-lite\/assets\/images\/submit-spin.svg\" class=\"wpforms-submit-spinner\" style=\"display: none;\" width=\"26\" height=\"26\" alt=\"Loading\"><\/div><\/form><\/div>  <!-- .wpforms-container -->\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>OEM Earbuds Factory Quality Checklist The sample pair worked perfectly. Great pairing, clean audio, solid fit. Six weeks later the 3,000-unit order lands and customer service starts fielding complaints: dead left channel, cases that stop charging at 70%, Bluetooth that drops every time someone walks past a microwave. Nothing was wrong with the sample. Something&hellip;&nbsp;<a href=\"https:\/\/www.tashells.com\/ar\/oem-earbuds-factory-quality-checklist\/\" class=\"\" rel=\"bookmark\">\u0627\u0642\u0631\u0623 \u0627\u0644\u0645\u0632\u064a\u062f &raquo;<span class=\"screen-reader-text\">\u0642\u0627\u0626\u0645\u0629 \u0627\u0644\u062a\u062d\u0642\u0642 \u0645\u0646 \u062c\u0648\u062f\u0629 \u0633\u0645\u0627\u0639\u0627\u062a \u0627\u0644\u0623\u0630\u0646 \u0627\u0644\u0623\u0635\u0644\u064a\u0629 \u0645\u0646 \u0627\u0644\u0645\u0635\u0646\u0639<\/span><\/a><\/p>","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"elementor_header_footer","format":"standard","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"","neve_meta_content_width":0,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","_themeisle_gutenberg_block_has_review":false,"footnotes":""},"categories":[1],"tags":[1094,1093],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.9.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>OEM Earbuds Factory Quality Checklist | Tashells Audio<\/title>\n<meta name=\"description\" content=\"A stage-by-stage OEM earbuds factory quality checklist: IQC, in-process QC, final inspection, AQL, and certifications to run before your next order.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.tashells.com\/ar\/oem-earbuds-factory-quality-checklist\/\" \/>\n<meta property=\"og:locale\" content=\"ar_AR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"OEM Earbuds Factory Quality Checklist | Tashells Audio\" \/>\n<meta property=\"og:description\" content=\"A stage-by-stage OEM earbuds factory quality checklist: IQC, in-process QC, final inspection, AQL, and certifications to run before your next order.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.tashells.com\/ar\/oem-earbuds-factory-quality-checklist\/\" \/>\n<meta property=\"og:site_name\" content=\"Tashells Audio | Bluetooth Earbuds Manufacturer | OEM TWS Factory in China\" \/>\n<meta property=\"article:published_time\" content=\"2026-08-21T03:56:33+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-08-21T03:59:41+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.tashells.com\/wp-content\/uploads\/2026\/08\/qc-inspector-checking-tws-earbuds-pcb.webp\" \/>\n<meta name=\"author\" content=\"Ai, John\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u0643\u064f\u062a\u0628 \u0628\u0648\u0627\u0633\u0637\u0629\" \/>\n\t<meta name=\"twitter:data1\" content=\"Ai, John\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u0648\u0642\u062a \u0627\u0644\u0642\u0631\u0627\u0621\u0629 \u0627\u0644\u0645\u064f\u0642\u062f\u0651\u0631\" \/>\n\t<meta name=\"twitter:data2\" content=\"9 \u062f\u0642\u0627\u0626\u0642\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.tashells.com\/oem-earbuds-factory-quality-checklist\/\",\"url\":\"https:\/\/www.tashells.com\/oem-earbuds-factory-quality-checklist\/\",\"name\":\"OEM Earbuds Factory Quality Checklist | Tashells Audio\",\"isPartOf\":{\"@id\":\"https:\/\/www.tashells.com\/#website\"},\"datePublished\":\"2026-08-21T03:56:33+00:00\",\"dateModified\":\"2026-08-21T03:59:41+00:00\",\"author\":{\"@id\":\"https:\/\/www.tashells.com\/#\/schema\/person\/baeeb8a18f73d0349ba18940ec6092dc\"},\"description\":\"A stage-by-stage OEM earbuds factory quality checklist: IQC, in-process QC, final inspection, AQL, and certifications to run before your next order.\",\"breadcrumb\":{\"@id\":\"https:\/\/www.tashells.com\/oem-earbuds-factory-quality-checklist\/#breadcrumb\"},\"inLanguage\":\"ar\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.tashells.com\/oem-earbuds-factory-quality-checklist\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.tashells.com\/oem-earbuds-factory-quality-checklist\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/www.tashells.com\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"OEM Earbuds Factory Quality Checklist\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.tashells.com\/#website\",\"url\":\"https:\/\/www.tashells.com\/\",\"name\":\"Tashells Audio | Bluetooth Earbuds Manufacturer | OEM TWS Factory in China\",\"description\":\"Professional Bluetooth Earbuds Manufacturer for OEM &amp; 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