Red 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.