Features:- Portable lightweight and sweatproof design- Built-in microphone- Built-in rechargeable Li-ion battery- Multipoint pairing (connect 2 bluetooth device)- Voice command for picking up / rejecting calls- Built-in 14.2mm nedymium driver- Clear bass resonance、 CVC wind noise reduction、 and superior sound isolation Technical Specification:-Bluetooth specification: 4.1+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 Package:1 X Sport Bluetooth Headset1 X USB charger cable4 X Ear rubber4 x ear hook