Product Description: Bluetooth version: 4.0 Support AVRCP A2DP HFP HSP Smart voice active Cable Length: about 60cm Effect distance: within 10m Call duration and music playing: about 3 hours Stand-by time: about 60 hours Fashionalbe sportstyle design CVC 6.0 noise isolating tech Supports answering, ending, rejecting calls, volume down/ up, music pre/next function Can be connected with two smartphones at the same time Support English and Chinese voice guidance(Caller id, power on/off, connect successfully. etc) Support iOS and Andriod, but only iOS can show the percent of battery Charged via attached micro USB cable (about 21.2cm) Only 10g weight Built-in rechargeable 80mAH battery Comes with a clip to clip on your cloth