Bluetooth Earbuds CSR 4.0 Aptx Codec, Premium Sweat Proof Headphones with Built in Microphone - Black SMALL AND LIGHTWEIGHT: 60% Smaller and More Lightweight then the Competition Models ADVANCED BLUETOOTH CSR 4.0 TECHNOLOGY WITH APTX CODEC: deliver Wireless Music and Calls coupled with superior audio performance rivaling the best in wired headphones TECHNICAL ERGONOMICS DESIGN: with medical earmuffs makes you feel more comfortable and stable. CONVIENIENT ON BOARD CONTROLES: allow you to change volume, play and pause your music, and answer the phone without skipping a beat CVC 6.0 SMART NOISE REDUCTION: improve call quality, Built-in HD microphone, get high-quality voice recording You can begin enjoying CD quality stereo sound instantly