Outline:2015 Newest Wireless CSR 4.1 Bluetooth headphone headset In earphone, stereo two-channel MP3 Music Handsfree with vibration microphone for all phone and other bluetooth devices.This product uses the new headset shape design(Diamond Cutting), using the world famous Bluetooth Stereo Bluetooth chips, to ensure high-fidelity sound quality and stable performance and excellent call quality. This product supports Bluetooth V2.1 version, support for Bluetooth A2DP and calling features. Battery time supports up to 4-6 hours. Fectures:- Bluetooth V4.1- Portable lightweight and sweatproof design- Built-in microphone- Built-in rechargeable Li-ion battery- Multipoint pairing (connect 2 bluetooth device)- support connect 2 bluetooth device in the same time.- Support voice calls prompt, reporting calls number in English / chinese- Support stereo listen music- Support change music,and adjust volume- Support multi language voice prompt: in English / chinese- 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-Weight: 3.5g