Introducing the WH-XB910N - it offers the deep, powerful EXTRA BASS sound typical of Sony with real vocal clarity for a full, balanced listening experience. Active noise cancelling with Dual Noise Sensor technology allows you to truly hide the world around you. With a battery life of up to 30 hours, the WH-XB910N Bluetooth Noise Cancelling Headphones are the ideal travel companion for long car trips or weekend trips. With the optional AC charger, a 10-minute charge is enough for up to 4.5 hours of music playback. Multiple connection allows you to connect two Bluetooth devices at the same time, and the convenient foldable design (with carry bag) makes travel and storage easier.