Vsport&reg; Light-weight Waterproof Bluetooth 4.0 Earphones Wireless Stereo Sport Earbud Headsets (Green) Blutooth Earphones with Mic sealing & unique Cavity Structure Design, increase 20% effective area in vibrating diaphragm, to provide you a HD stereo sound. CVC6.0 Smart Noise Cancellation Technology, eliminates the around noise and delivers a clean audio experience of hours of pure enjoyment. Built in HD microphone, ensures an utra-clear hands-free phone calls, and let you don't be bother by the nearby noises. Sweat-proof & Durable Design, worn behind the neck and over ear, make you easy accessible to control the music or calls, Perfect for Work Out. Buit in high-quality polymer battery (80mAh), 2 hour charging time, up to 5 hours of talk/playing time and 175 hours standby time, no need to charge frequently any more.