Ultimate Fit and Comfort: Twist the 210 rotatable ear hooks until you find the perfect spot for your ears. The unique design and lightweight build keeps Sport X10 workout earbuds comfortably and securely in place throughout your workout. Hardcore Beats for Maximum Motivation: The dynamic acoustic system delivers 2 more bass while preserving the clarity of mids and treble. BassUp technology analyzes and enhances your music's bass in real-time for an extra boost. Exercise-Proof Buds: Sport X10 workout earbuds have a fully-waterproof, IPX7-rated build that stops liquids in their tracks. For further protection, our exclusive SweatGuard technology defends against the corrosive properties of sweat. Up to 32 Hours Playtime: Get 8 hours of music from a single charge of the workout earbuds and add an extra 3 full recharges via the charging case.