Premium sound quality - these Bluetooth headphones support High-Resolution Audio, and even compressed music files are upscaled using our evolved DSEE Extreme technology. Speak-to-Chat automatically pauses playback when you start a conversation, Wearing Detection powers off your headphones when you're not wearing them, plus more smart features for a seamless, hands-free listening experience. With multipoint connection, your Sony headphones can be paired with two Bluetooth devices at the same time 30 hours battery life (with Noise Cancelling on) plus fast charging (10 min charge for 5 hours playback)2 (Disclaimer in description) Industry-leading noise cancellation Wherever you are, the WH-1000XM4 headphones deliver our best ever noise-cancelling performance. The technology that makes it happen Dual sensors and the HD Noise Cancelling Processor QN1 cancel noise in real time. All-day power and quick charging A huge 30 hours of battery for all-day play, and 5 hours of power with just 10 minutes charging. Headphones that react to you The proximity sensor and two acceleration sensors detect the wearer and adjust the sound. For everyday convenience, just Speak-to-Chat As soon as you speak to a friend Speak-to-Chat stops the music so you can talk without distraction.