Upgraded Sound Quality: 11mm vibrating diaphragm, enhanced bass, and reduced distortion lets you get completely immersed in your music.. Secure Fitting: Unique ergonomically designed ear-hooks ensure that your earphones stay comfortably fitted 15hrs Playback Time: Built-in lithium battery, charging for just 2 hours can give you 15hrs of talking time or playback time. IPX7 Waterproof: Internal water-resistant Nano-coating protects headphones from heavy rain or sweat during strenuous exercise. You can enjoy music while running, jogging, hiking, cycling, doing yoga, going on vacation, exercising, and doing other outdoor sports Secure Fitting: Unique ergonomically designed ear-hooks ensure that your earphones stay comfortably fitted. Bluetooth 5. 0: Uses RCV technology to eliminate microphone background noise and enhance voice distinction, our AFH chip ensures seamless wireless connectivity between Bluetooth devices within 33 feet