Different kinds of USB recorder inspection:
USB audio recorder
USB recording device
USB dvr recorder
USB voice recorder
windows USB recorder
macbook USB recorder
Some common factors for USB recorder quality control:
Appearance
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
