Keep your music playing all day with a battery life that delivers up to 50 hours of power. 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. The EQ Custom feature on the Sony | Headphones Connect App tailors sound to your personal preference. Choose from a variety of presets to match sound quality with the genre of music you're listening to. Or create and save your own presets. Designed with comfort in mind, the WH-CH520 headphones are lightweight and feature soft earpads, additional head cushion and silent joints so you can enjoy your favorite music and podcasts all day long. Conversation flows freely with easy hands-free calling, thanks to the built-in microphone. No need to even take your phone from your pocket. For total convenience, these Bluetooth headphones can be paired with two Bluetooth devices at the same time. Simply switch from a video or song on your laptop to a call on your cellphone, so that you’ll never miss a call.