Bvnine Lightweight Flexible Wireless Earhook Headphones Waterproof Sweatproof Sports Bluetooth Headset With Mic (Blue) CRYSTAL CLEAR SOUND--Imported Bluetooth Chip CSR8645 brings high-fidelity stereo sound; with the SNR index: S/N over 95. EARHOOK NECKBAND DESIGN--special design makes it stable and comfortable to wear during workout/running/gym/exercise, etc.; and the 45 adjustable earbud makes a better fit. MUSIC & TALK HANDS FREE--with built-in microphone, you can enjoy music without missing calls, hands free; SWEATPROOF & LONG BATTERY LIFE--high-quality silicone material, which is flexible and adjustable, makes it perfect sweatproof sport headphones; it's equipped with 80mA rechargeable battery supporting 15 hours talk, 4-6 hours music and 120-130 hours standby and it can be charged full within just 2 hours. COMPATIBILITY--the headphones is capable of connecting two phones via Bluetooth simultaneously; compatible with all Bluetooth-enabled devices, including smart phones/ipads/laptops, MP3 & DVD players, etc.;