Built-in microphone, voice prompt power on/off and
Built-in microphone, voice prompt power on/off and pairing, support voice dial for iPhone. Enhanced noise reduction, good choice for listening music, watching movie, talking on the phone, etc. Multifunctional key allows you power on/off, answer/hang up/reject/redial the last number, pause and play. Build-in rechargeable li-battery, charge via USB cable for 2~3 hours.