Bluetooth 4.1 Technology ensures perfect stereo sound quality with high Bass. Comes with balanced left and right stereo channels. Built-in HD Microphone with CVC 6.0 Noise Cancellation. Durable design and comfortable earbuds ensures that earphones always stays in place while running, jogging and workouts. Invisible nano-coating technology protects earbuds against sweat during workout. Eliminate the white noise and delivers a clean audio experience even in noisy occasions, offering hours of pure enjoyment. Built-in rechargeable powerful lithium battery (80mah) provides upto 150 hours of Standby time and 6-7 hours of talk time and 5 hrs of play time. Fast pairing with all the smartphones having bluetooth functionality. All iOS devices, All Android devices, Apple Watches and Other Bluetooth Smartphones/devices.