Driver Unit:Φ40*2
Frequency Response:20-20KHz 
Impedance:26Ω±15% at 1KHz 
Sensitivity:95±3dB at 1KHz 1mW 
THD:≤3% at 1KHz 1mW
Max Input Power:40mW
Bluetooth ver.: V4.1
Chip:WS9623
Working time:20hrs(70%volume)
Standby time:Around 400 hrs   
Charging connector0:Micro USB
Charging time:Around 2 hrs