Experience superior sound without compromise: Powered by Sennheiser's TrueResponse transducer with a wide range of Bluetooth codec support (AAC, aptX, aptX Adaptive, SBC) Long battery life: Up to 24 hours of music playtime with on the go charging with the high-quality case that comes with the product Active Noise Cancellation & light-weight ergonomic design: The ergonomic design offers optimal comfort and a secure fit with 4 ear adapter sizes for excellent Active Noise Cancellation Full digital control: Our Smart Control App for iOS / Android allows earbud functionalities to be personalized for your everyday needs and enables smooth pairing; fully adaptable controls for music, calls & voice assistant Bass Boost: Special EQ pre-set activated via our app for more intense bass. Sennheiser uses decades of expertise to drive the world of audio technology forward for new, unique sound experiences IPX4 splash resistance: Enjoy an outstanding audio experience no matter where you are