QFX H-250BT Bluetooth Stereo Headphones with Microphone: * Bluetooth v2.1+EDR * Bluetooth Protocol: A2DP/AVRCP * Range: 40" * Calling: 10 h * Listening to Music: 10 h * Standby Time: 300 h * miniUSB to USB to charge headset * Charging Input Voltage: DC +5.0V +/- 0.25V * Flat Cable Length: 1.5m * Detachable cable * 3.5mm stereo plug * Color: black