Sennheiser sound tuned for sports. Adaptive ANC. Secure fit ideal for a wide range of sports. Shock dust and sweat resistant design. Integrated performance tracking sensors measure Heart Rate and Body Temperature. Use with leading sports watches apps and fitness equipment. Semi-open design for greater acoustic relief. Full Polar integration plus free access to Polar Flow. Smart Control app. Up to 6 hours of playtime - 24 hours total with charging case. Includes: Silicon ear tips (S/M/L). Silicon ear fins (N/S/M/L). USB-C charging cable. Finger lanyard.