Specifications: Bluetooth Specifications: Version1.2, Class2, 10Meters Bluetooth Profile Supported: Headset&Hands-Free Profiles Operating Frequency Band: 2.402to2.480GHz unlicensed ISM band Battery: 3.7VDC, 850mAh, AC/DCChargerr: DC5to6V, 300mA Normal Charge time: 3hrs, (approx) Talk time: 8 to 10 hrs Standby time: 200hrs Dimension: 93*58*25 Weight: 65g(With battery) Main Functions A: Match with bluetooth mobile phone, it is safer to talk over the phone when you drive B: Multimedia function supports A2DP, match with bluetooth mobile phone, and allow you to listen to the music in the mobile phone. C: There is light prompt when there is an incoming call or a message is received in the mobile phone D: When you leave your car for a long while and come back, the mobile phone will be automatically reconnected without manual intervention. E: Press V-key for a few seconds during a call to automatically switch between hand free and the mobile phone F: Double click K1 to automatically dial the last dialed call G: If the mobile phone supports voice dialing, you can press K1 key to make a voice dialing H: Can connect to two bluetooth devices at the same time (If there is an incoming call when you are listening to a song, you can pause the song to receive the call, and continue to listen to the song when the call is over).