Perfect Workout Headphones: Snug and secure with IPX6 rated waterproof material - no more worrying about damage caused by sweat or light rain Magnetized for Enhanced Convenience: Built-in magnets let you attach the headphones like a necklace when not in use, a convenient way to carry them around Rechargeable, Long Life Battery: Enjoy 9 hours of continuous music or relax with 80 hours of standby time when powered with a 5V external charger Crystal Clear Voice Calls: cVc 8. 0 Noise Cancelling Microphone reduces outside noises Superior Sound: aptX codec provides pure, CD-like high quality sound for compatible devices