Smart Listening by Adaptive Sound Control automatically detects your activity, whether you're walking on a crowded street or sitting in a quiet area. You can customize them to your preferences with the Sony I Headphones Connect App. Enjoy up to 9 hours of battery life, with 3 hours of music playback and up to 9 hours play time with chargeable carrying case. Listen free from unwanted background sound with Digital Noise Cancellation; Just your music, with no wires to get in the way. Conversation flows freely with easy, hands-free calling. Leave your phone where it is: just speak with a tap. ComponentsEarphone, charging station, cable