Up to 28 hours of battery life: 9 hours of playtime per charge for the earbuds, plus another 19 hours of battery in the charging case. Crisp, smooth sound quality from 6mm dynamic drivers lets you hear music and calls clearly. Silicone ear tips allow for a light, ergonomic fit. IPX4-rated sweat and water resistance. App-free push buttons control play, pause and shift music tracks, and take calls with just a few taps. Mono mode allows use of one earbud at a time to extend battery life and stay alert of surroundings. Black.