MOMENTUM Sport defines a new class of sports earbuds. Fuel your performance with unrivaled Sennheiser sports sound delivered by high-quality acoustic transducers. Robustly designed for multi-sports use, the secure, comfortable fit lets you confidently perform in any environment. When working out in noisy environments, the impactful bass and Adaptive ANC let you stay energized and in the zone without distractions. Built for athletes who demand reliable and durable gear, the 24-hour battery life goes as hard as you do, and the IP55-rated earbuds are shock, dust, and sweat-resistant to withstand extreme workouts and harsh weather conditions. A semi-open design with an innovative acoustic relief channel reduces body-borne noises, like footsteps or breathing, for a natural feel and lets you hear some external sound for greater awareness when training outdoors. The Transparency Mode is tailored for sports with external mics that minimize wind noise so you can hear your world when on the move. Body performance tracking sensors integrated into the earbuds measure heart rate and body temperature for sports ecosystems. Full access to the Polar Flow app provides seamless tracking of crucial body performance data. MOMENTUM Sport will enhance your performance from digging deep to hitting your peak.