TOTU BT-2 V4.1 Wireless Headphones Sweatproof Music Stereo Sports Headset, Black Amazing sound quality - advanced aptx sound and Bluetooth 4.1 Technology delivers astonishing acoustics Incredibly comfortable, secure fit - the flexible stabilizing ear hooks mold to your ears, so you don't have to readjust the wireless headphones Stable signal connection and durable design - latest CSR chipset guarantees solid performance within 10 meters operational distances Feel free to break a sweat - a thin layer of liquipel protects the bt-2 Bluetooth headphones from moisture Compatible with iPhone 6/6S, 6 Plus/6S Plus, 5S 4S, iPad air, Samsung galaxy S6,S5,S4, HTC M9, LG flex 2 G3 G2, and other devices