The JBL Tune 520BT headphones stream powerful JBL Pure Bass Sound thanks to the latest Bluetooth 5.3 technology. Manage calls, sound and volume with convenient buttons on the ear-cup. Connect to two devices at the same time and effortlessly switch between them. Download the free JBL Headphones App and customize your sound through the EQ, while voice prompts guide you through the headphones’ features. Comfortable and lightweight design. Up to 57 hours of playtime when fully charged; up to 3 hours of playtime with just 5 minutes of charging.