Sennheiser Superior Sound: Powered by Sennheiser’s TrueResponse Transducer for high fidelity sound Product Note : If the size of the earbud tips does not match the size of your ear canals or the headset is not worn properly in your ears, you may not obtain the correct sound qualities or call performance. Change the earbud tips to ones that fit more snugly in your ears Active Noise Cancellation & Transparent Hearing: Block out noise or gain awareness of external sounds at a touch in any environment Customizable Touch Controls: Personalize touch controls for music and voice assistant to match individual preference for intuitive operation IPX4: Splash resistance for trouble-free use while travelling, commuting or exercising Battery Life: 24 hours total. Up to 8 hours play back time and further 16 hours with on-the-go charging via the case