NEW S7 high quality Bluetooth headset with a microphoneDescribe:

Bluetooth version : 4.2                         

Speaker driver size : 10mm

Impedance : 18Ω±10%

Frequency response : 20Hz-20KHz

Max. Input power : DC5V

Sensitivity :102±3dB

Battery :60mA

Charging time(PC/Laptop) : 0.2hr

Playback time :3hr