Bluetooth Headphones,Coolcat Music Bluetooth Wireless Sports Gym Excercises Sweatproof Headsets Noise Cancelling In-ear Earbuds With replaceable battery With Mic for Smartphones Devices(Blue) Music Bluetooth new subversion Sports-style music Bluetooth V4.1 headset with the replaceable battery Double configuration capacity and the lasting music time reaches 16 hours Enjoy wireless fabulous music CSR4.1 APTX audio compression technology will provide CD stereo audio via Bluetooth with wireless connection, the complete audio frequency bandwidth and high fidelity performance, demonstrating the superior stereo audio quality in the Bluetooth connection Clear and convenient communication Voice telegraphing and acoustic answering. without manual operation.Say "YES" or "NO" answer decline a call Special noise reduction and give you a HD calling experience DSP high-definition sound quality and CVC6.0 noise reduction technology, High sensitive microphone reducing external noise and the echo interference in closed environment, bringing you the real HD calls Compatible with all kinds of Bluetooth devices Can quickly connect two different mobile devices within the effective range.