Description The JBL Tune 520 headphones stream powerful JBL Pure Bass sound thanks to the latest BT 5.3 technology that is easy to use. These headphones offer up to 57 hours of pure enjoyment and an additional 3 hours of battery with just 5 minutes of charging. Download the free JBL Headphones app and customize your sound with EQ while voice prompts guide you through the headphones' features. Manage calls, sound, and volume from the earpiece, thanks to the convenient control button. If a call comes in while watching a video on another device, the JBL Tune 520BT seamlessly switches to your mobile device, so you'll never miss a call. Lightweight and comfortable even after hours of listening, the JBL Tune 520BT headphones fold flat into your backpack to follow you everywhere