Stunning sound and longer battery life Enjoy high sound quality all day long. The WH-CH520 headphones with up to 50 hours of battery life, stable connectivity, and enhanced call performance, meet the demands of your day. Stay powered up for days With up to 50 hours of battery life, you can listen to your favorite music without worrying about running out of charge. And, if your headphones battery is running low, a 3-minute quick-charge can give you 1.5 hours of listening time. A listening experience just for you Digital Sound Enhancement Engine (DSEE) restores the harmonics and liveliness lost during typical music compression, for a more authentic performance. You can even tailor music to your own taste with EQ settings on the Sony | Sound Connect app, for a personalized listening experience. Crystal clear calls A built-in microphone provides you with hands-free calling, and it also works just as well for joining an online class or work meeting. Designed for all-day comfort Not only is the design stylish, but it’s also crafted with ease-of-use in mind. The lightweight build and swivel earcups gently slip on and off, while the adjustable headband, cushion and soft ear pads give you all-day comfort. Listen longer with up to 50-hour battery life Keep your music playing all day with a battery life that delivers up to 50 hours of power.1 USB Type-C quick charging gives up to 90 mins of play back from 3 minutes of charge. Now you’ll have enough power for multi-day road trips and long festival weekends. Enjoy all day comfort With an adjustable headband, soft earpads and lightweight design, you can find your perfect fit and stay comfortable for longer. General Features Headphone Type Closed Driver Unit 30mm Wearing Style On Ear DSEE Yes Frequency Response (Bluetooth Communication) Frequency Range(A2DP): Yes General Features (Active Headphones) Volume Control: Yes Size & Weight Weight Approx. 147g Battery Battery Charge Method USB BATTERY LIFE (CONTINUOUS COMMUNICATION TIME) Max. 40 hours General Features (Active Headphones) Max. 50 hours Lithium Battery Yes Bluetooth Specification Bluetooth version BLUETOOTH Specification Version 5.2 Effective Range 10m FREQUENCY RANGE 2.4 GHz band (2.400 0 GHz - 2.483 5 GHz) Profile A2DP, AVRCP, HFP, HSP Supported Audio Format(s) SBC, AAC Supported Content Protection SCMS-T What’s in the Box SUPPLIED ACCESSORIES USB Cable