Different kinds of USB recorder inspection: 
USB audio recorder
USB recording device
USB dvr recorder
USB voice recorder
windows USB recorder
macbook USB recorder

USB recorder inspection
Some common factors for USB recorder quality control:
Quantity check 
Measurement(weight& size&thickness)
Basic function test
Read-write speed test
Capacity test
Battery voltage test
Internal check
Charging test
3M tape test for Logo
Barcode scanning
Compatible with windows/macbook check
Carton dropping test
USB recorder quality control


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