Features: 1) Uses the high performance lithium polymer battery 2) Bluetooth protocol: CSR1.2 3) Bluetooth frequency: class 2 4) Speaking time: 4 hours 5) Standby time: 150 hours 6) After pairing with Bluetooth stereo mobile phone, BTH013 can be used as wireless handsfree to enjoy stereo excellent music 7) You could tune to the stereo music from the phone after paring with cellphone, which supports 1.2A2DP mode when there''s a coming call when listening to the music, headset will transfer automatically to handsfree mode; and will be music mode again automatically when you end the call 8) With PC, and authorized the device in cellphone rig with PC successfully, functions all above is available Outer packing: Color box