Youngway Sports Headset with Built-in Microphone,Wireless Stereo Bluetooth Headphones Noise Cancelling with Microphone for iPhone Samsung Smartphones (BLACK) Comfortable: Light-weight and sweat proof. As light as 18 grams. Never a burden to the ears. Rubber coating is comfortable to touch and wear, soft and skin friendly. With ergonomical design, ear hooks and rotatable earbuds makes the headsets fit your ear perfectly. HD stereo sound: Perfectly transfer HD music. Super stereo sound performance. Built-in microphone. Call functions: Built-in Microphone. Picking up and hanging up phone calls. Easy charging: Built-in rechargeable Lithium-poly battery. Can last up to 5 hours while listening to music or talking on the phone. This powerful rechargeable battery has up to 180 hours of standby time. Compatibility: Comes with the recently updated Bluetooth 4.1 with enhancements in coexistence, better high quality connections, and improved faster data transfer. Bluetooth 4.1 allows devices to reconnect automatically when they are in proximity of one another. These wireless headphones can connect with Bluetooth enabled music players & A2DP enabled devices.