Bluetooth version: 4.0 The supported devices: Bluetooth mobile phones, Bluetooth speakers, Bluetooth PC and other Bluetooth devices The maximum work range: 33 feet (10 meters) Battery capacity: 300mAh Music play/talk time: around 10/12 hours Charging time: 3 hours Charging voltage: DC 5V Sensitivity: 100±3dB Frequency response: 20-20kHz