Sony WH-CH520 wireless headphones deliver a high-quality listening experience. Sony's Digital Sound Enhancement Engine (DSEE) restores digital music files closer to the original recording quality. 360 Reality Audio certification provides a more immersive listening experience and you can even personalize your audio settings in the Sony | Headphones Connect app. Designed for everyday ease. Fully charged, you can enjoy up to 50 hours of battery life. If you're in a hurry, 3-minute fast charging will give you 1.5 hours of playback For more comfort, the headband is adjustable with soft ear cushions and a lightweight design. This Bluetooth headset includes multi-point connectivity which means you can be connected to two devices at the same time (laptop and phone), plus - Fast Pair and Swift Pair for easier connectivity. Answering incoming calls with Sony wireless headphones is effortless. At the touch of a button, you can enjoy crystal clear call quality, thanks to Sony's noise canceling technology.