The Digital Sound Enhancement Engine (DSEE) restores your music with high frequency and gradual fade out sound for a more authentic performance. You can even tailor to your own taste with EQ settings on the Sony | Headphones Connect app, for a personalised listening experience.360 Reality Audio Certified – optimise your experience by analysing your individual ear shape on the Sony | Headphones Connect app, and enjoy the ultimate immersive music experience. With up to 50 hours of battery life, you can listen to your favourite music without worrying about running out of charge. And, if your headphone battery is running low, a 3-minute quick-charge can give you 1.5 hours of listening time. With an adjustable headband, soft earpads and lightweight design, you can find your perfect fit and stay comfortable for longer with these on ear headphones. The WH-CH520 has Multipoint Connection, easy button operation, and can even be controlled with your voice. And since connection is easy with Swift Pair and Fast pair, these Sony headphones are ideal for everyday use. Easily answer calls with one click of the buttons on the earcups, so there’s no need to take your phone from your pocket. With a high-quality built-in microphone and noise suppression processing, the WH-CH520 collects sound and reduces ambient noise during calls, so you can make clear calls even in noisy environments.