CRYSTALCLEAR LOSSLESS AUDIO Sennheiser TrueResponse transducer system with aptX Lossless offers CD-quality sound with exceptional clarity and rich detailADVANCED ADAPTIVE ANC TRANSPARENCY MODE Automatically filters ambient noise while AntiWind Mode enhances call clarity in windy environments. Quickly toggle external awareness to stay connected with your surroundings without removing earbudsLE AUDIO AURACAST READY Next-generation Bluetooth capabilities unlock improved energy efficiency, multi-device broadcasting, and spatial audio via firmware updateALLDAY COMFORT FIT Ergonomic design with soft silicone tips ensures secure, long-lasting comfort for hours of use30 HR PLAYBACK Qi FAST CHARGING Enjoy up to 30 hours total battery life get 1 hr play from just 8 min Qi fast charge.