Introducing the WH-CH520 Wireless Headphones - for a high-quality listening experience.Our Digital Sound Enhancement Engine (DSEE) restores digital music files closer to the orginal recording quality, 360 Reality Audio Certified presents a more immersive listening, and you can even personalise your sound settings in the Sony | Headphones Connect app.Enjoy up to 50 hours of battery power when fully charged, and if you're in a hurry, a quick 3-minute charge will give you 1.5 hours of playback!For your comfort, the headband is adjustable, with soft earpads, and a lightweight design.This Bluetooth headset includes Multipoint Connection, so you can connect two devices (such as your laptop and phone) simultaneously, as well as Fast Pair and Swift Pair.Calls on these Sony wireless headphones are crystal-clear, thanks to our noise suppression technology.