Driver Diameter: 9mm
Impedance: 16Ω
Sensitivity: 94±3dB
Frequency Response: 20Hz-20kHz
Talk time: 5 hours
Standby time: 180 hours
Bluetooth range: 10 meters

1.Bluetooth Version CSR V4.0
2.Easy to use, built-in microphone and line control.
3.Built-in  lithium battery, connected Micro USB cable to charge.