Bluetooth Headphones Mini Lightweight Wireless Earphones Stereo Music Sport Earbuds Headsets (Bluetooth 4.0, Balanced Audio, Build-in Microphone, CVC 6.0 Noise-Cancelling)--Black A840 Latest Bluetooth 4.0 technology, 10-meter working distance, our sport headphones will let you enjoy music when running, gym, sports & exercise and other activities PureSound In-ear white noise and listener fatigue reduction. Eliminates the white noise and delivers a clean audio experience offering hours of pure enjoyment Lightweight, comfortable, with built-in mic for hands-free calling, Up to 8 hours of Talk/Playing Time and 200 hours Standby Time High-fidelity stereo music and clear speech, You can begin enjoying CD quality stereo sound instantly Simple-to-use: control all functions of your music (volume, sound, song selection) and calls from your phone via our simple-to-use user interface on the headphones themselves