Driver Unit: Φ40*2
Frequency Response: 20-20KHz
Impedance: 26Ω±15% at 1KHz
Sensitivity: 96±3dB at 1KHz 1mW 
THD: ≤3% at 1KHz 1mW
Max Input Power: 40mW
Bluetooth ver.: V4.1
Chip: VIMICRO
Working time: 15 hrs 
Standby time: 500 hrs 
Charging connector: Micro USB
Charging time: Around 2.5 hrs