Bluetooth Version: V4.2

Frequency Range:20Hz-20kHz

Sensitivity:99db+3db

DC Resistance:32Ω

Receiver Distance:Up to 10 Metres

Battery Voltage: 600mAh 

Charging Voltage:DC 5V

Charging Time:20-40 minutes

Music/Talk Time:Up to 3.5  hours

Features:Automatically Matching,Sensitivity Microphone,Easily Charge via USB Port,Volume Control  etc.

Color: Black