Black finish Bluetooth Stereo Headphones with Microphone and built-in Rechargeable Battery; Bluetooth V3.0+ EDR, Bluetooth protocol: A2DP/AVRCP, 40 Feet Range, Micro-SD Port, Built-in FM Scanning Radio, AUX-In, Calling: 10 Hours, Listening to Music: 7 Hours, Standby Time: 300 Hours, Mini-USB to USB to charge headset, Charging input voltage: DC +5.0 0.25V, Flat Cable Length 1.5 M (4.9 Feet), Detachable Cable, 3.5mm Stereo Plug.