High quality sound and comfortable, all-day listening in a wireless headphone. The WH-CH520 have an ultra-long battery life of up to 50 hours and a 3-minute quick charge gives you up to 1.5 hours of audio playback. Built in Music Controls and Microphone. Multipoint connection allows you to quickly switch between two devices at once. Key Features With up to 50-hour battery life and quick charging, you’ll have enough power for multi-day road trips and long festival weekends. Great sound quality customizable to your music preference with EQ Custom on the Sony | Headphones Connect App. Boost the quality of compressed music files and enjoy streaming music with high quality sound through DSEE™. Designed to be lightweight and comfortable for all-day use Crystal clear hands-free calling with built-in mic. Multipoint connection allows you to quickly switch between two devices at once. Find your headphones easily with Fast Pair. Connect to your PC easily with Swift Pair. 360 Reality Audio compatible so you can fully immerse yourself in sound all around you Siri/Google Assistant compatible. Swivel design for compact and easy carrying. Partially made with recycled plastic and uses plastic-free packaging. Build-in microphone