Rich treble and thumping bass: sound buds Curve Bluetooth earbuds are powered by 10 mm composite drivers. The ultra-elastic outer ring produces deep bass and a lightweight and flexible composite Bio-cellulose dome delivers mids and highs with enhanced clarity. Up to 43% more bass: our exclusive BASSUP technology conducts real-time analysis of low frequencies to instantly strengthen the Bass output. Feel the bass as it surges through your body and pumps You up for the workout ahead. Hardcore playtime: 18 hours of listening (at 80% volume) gives you the power and motivation needed to fuel over two weeks of workouts. When youƒ??re in a rush, a 10-minute charge will provide you with up to 3 hours of continuous playtime. IPX7 Waterproof: SoundBuds Curve Bluetooth earbuds are defended by a fully waterproof casing thatƒ??s based on a submarineƒ??s structure. Push yourself during your workout without fear of sweat and rain damaging your earphones. You can even rinse them with water when cleaning. Secure and Comfortable Fit: The Bluetooth earbuds are ergonomically designed and come with EarTips and EarWings in various sizes to tailor the fit to you.