Liger Blaze Bluetooth 4.1 Sweatproof Earbuds Noise Cancelling Headphones with Mic 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 ergonomic design, ear hooks and rotatable earbuds makes the headsets fit your ear perfectly.Along with their rubber coating, these headsets hardly cause foreign body sensation when wearing. Friction been reduced to minimum on condition that the earbuds can fit in ears firmly when doing sports. CALL FUNCTIONS: Built-in Microphone. Picking up and hanging up phone calls. In standby mode, double-click the MF button, can redial your last call. HD SOUND: Perfectly transfer HD music. Super sound performance. Built-in microphone. Detailed voice instructions to guide you for easy using. EASY CHARGE: Built-in rechargeable Lithium-poly battery. Can last up to 7 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.