Optional color: orange / silver / blackFeatures:- Bluetooth V4.0- Portable lightweight design- Built-in microphone- Built-in rechargeable Li-ion battery- Multipoint pairing (connect 2 bluetooth device)- voice prompts ( Reporting phone number in English )- one to two:Two bluetooth device are connected at the same time.- Built-in 14.2mm nedymium driver- support listening musice.- fall compatible with all device with bluetooth. Technical Specification:-Bluetooth specification: 4.0+EDR-Bluetooth profiles:HEP1.6，SHP1.2，AVRCP1.4，A2DP1.2-RF range:10m-Noise reduction:CVC6.0-Stand- by time:about 175 times-Calculation conversation time:bout 5 hours-charging time: about 2 hours-Dimension(LXWXH):40X24X32MM-Weight:16.4g