Driver Unit: Φ8.6*2
Frequency Response: 20-20KHz
Impedance: 16Ω±15% at 1KHz
Sensitivity: 100dB±3dB at 1KHz 1mW 
THD: ≤3% at 1KHz 1mW
Max Input Power: 5mW
Bluetooth ver.: V4.2
Chip: WT200S
Working time: 5 hrs  
Standby time: 150 hrs 
Charging connector: Micro USB
Charging time: Around 1.5 hrs