Beyution Sports Wireless Bluetooth Headphones, Bluetooth 4.0 Version In-ear Design Behind the Neck Band with Micphone for All Smart Cellphone and Tablet with Bluetooth Function (BT508-Black) Bluetooth +apt-x+ A2DP technology Stereo Earbuds, Enjoy your Music Tangle Free In-Line Microphone and Controls for Music,Volume skip tracks and adjust volume Built-in microphone, answer phone calls easy, Digital noise reduction for call clarity Ultralight, comfortable, easy-to-wear. 33 feet working distance, Sport headphone, Up to 5 Hours of Listening and Talk Time Compatible with most Bluetooth smartphones, tablets and MP3 players