From the Manufacturer SPECIFICATIONS: Function Standby: power on Pairing, Play/Plause, Calling, Switch, Previous/Next, Volume+/- Parametric Frequency response: 80Hz~20kHz S/N Ratio:75dB Separation, 40dB Output power: 2.5W Connectivity USB Cable: USB female to USB cable 3.5mm to 3.5 stereo cable Power Power input: 5V DC (0.5A to 2A) Battery capacity: 1000mAh.