Highly sensetive speaker and enhanced quality of voice reception. Stylish, comfortable and engineered with cutting-edge Bluetooth technology. Compact and stylish design gives great stereo quality sound to your favourite music and enjoy music, call and VOIP at home, in the office or on the move. Frequency range: 2.4GHz-2.48GHz. Transmission power: Class 2. Transmission distance: about 15M. Operating voltage: 3.6V. Operating current: ≤25mA. Standby current: ≤1mA. Charging time: 1-2H. Talking time: 2H. Standby time: 50H.