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Preshipment Inspection > Bluetooth TWS Wireless Headset Headphone Earphone Speaker Router WIFI

The onsite quality preshipment inspection checklist for bluetooth devices like speakers, headsets, earphones, headphones, airpods, earsets, voice boxes, music boxes, audio plays, remote control, wireless, TWS etc are as follows:

  • Aesthetic, visual defects, workmanship, surface and function inspection
  • Quantity & assortment verifying
  • On-site safety, regulation & function testing
  • Measurements & sizes check
  • Product specs, and special requirements check
  • Packaging, safety and drop tests onsite
  • Labels, markings, logos & barcodes quality check

Because the quality control can happen at any production stages, normally most of them are at the final stage, the others are as follows:

inspection: Bluetooth TWS Wireless Headset Headphone Earphone Speaker Router WIFI

Our Checklist for Bluetooth device pre-shipment inspections are mostly as follows:

Perform a carton drop test on the export cartons:10 times(1 corner 3 edges 6 faces) (Pictures) N/A
Smell check-check if there are any strong offensive odor-II FAILED
For 3M tape adhesive test: perform test on coating (painting/plating/ screen printing, etc) with 3M tape.-S2 PASSED
Perform a rub test for printing and marking ; -S2 PASSED
Perform a function test - match and receive the Bluetooth signal. PASSED
Connect time – within 6 seconds PASSED
Perform a fatigue test for all adjustable part. PASSED
For each button function, including power on/off, volume +/-, forward/backward. PASSED
Perform a check for blue tooth range and phone check(6-10m) -S2 PASSED
Perform wobble test, put the unit on the flat surface, the unit should not tip or wobble during the test. PASSED
Perform an endurance test (life test) during the whole inspection period PASSED
Internal performance check. –S1 PASSED
Talkback function: MIC PASSED
Battery Voltage / Capacity: 5V +/- 0.5V PASSED
Output power: 2M (1K HZ, THD 10%) PASSED
Perform a Hi-pot testing -II PASSED
Perform the standard power test-II PASSED
Power consumption check:3Wx2(W=U2/R) PASSED
Visual Inspection Checklist (a random example):
Dent mark 1pc
Scratched mark 2pcs
Broken 3pcs

An earphone onsite testing results:

Earphone tests Impedance Margin Sensibility Frequence Input power Wire length Plug type Speaker D
specs 32-39 OMHS ≯1.8OM HS 108dB+/-10% 20-20kHZ 40mw 1.6m 3.5mm stereo 10mm
Unqualified qty 0 0 0 0 0 0 0 0
Unquality % 0 0 0 0 0 0 0 0
Sample 1 37.56 37.50 0.06 104.6 106.7 Ok 40 1.60 All 3.5mm All 10mm

3rd party preshipment products goods factory onsite inline final Random AQL PSI TPI FRI DUPRO third party on-site in-line pre-shipment QA QC check quality control assurance inspection services in China India Vietnam Thailand Malaysia Bangladesh Taiwan.