[True open-back headphones: AMAFACE sports headphones feature a completely open-back design that allows the earbuds to rest gently and securely on top of your ears. Open-back earbuds are generally lighter and more breathable than in-ear headphones making them more comfortable to wear for extended periods of time. "Be aware of your surroundings: Since open-back headphones dont go into your ears they make you more aware of your surroundings. When you listen to music while running or biking outdoors you can still hear the sounds of approaching cars or other potential dangers allowing you to get through your day safely." 25 hours play time: After a full charge the Bluetooth headset can last up to 5 hours and the charging box can charge the earbuds 4 additional times so you can get 25 hours of total play time after a full charge. In addition the smart LED in the charging box will flash alternately in multiple colors when turned on making your headphones look more charming. Automatic connection powerful stereo sound: Open the box search for Bluetooth devices connect with one click and pair automatically. The sports wireless earphones feature 10mm composite membrane speaker drivers that deliver pure balanced audio and clarity output for all music genres. Crystal clear deep resonant bass and a finely tuned sound signature deliver immersive sound that puts you center stage. Designed for exercise IPX6 sweat-resistant: Flexible and secure ear hooks gently rest on the contours of the ear to perform workouts without falling off. Adjustable ear hooks and ergonomic design ensure your workout headphones stay comfortable while running hiking jogging and other activities. IPX6 waterproof resistant to water exercise and rainy weather. Enjoy sports and outdoor activities without worrying about getting wet or sweaty.]