JBL Tune 520BT Wireless Headphones - Blue JBL Tune 520BT Features of JBL 520BT Headphones: Headphone Type: Over-ear headphones. Connectivity Technology: Wireless. Bluetooth Version: 5.3 Playback time: 57 hours Charging time: 2 hours Advantages of JBL Tune 520BT Headphones: Powerful JBL Pure Bass sound with the latest Bluetooth 5.3 technology. Long battery life up to (57 hours) of continuous playback. Allows you to get an additional 3 hours of playback with just a 5-minute charge. Free JBL Headphones app to customize your sound. Voice prompts provide ease of use for the headset's features. Control calls and volume by pressing the headset itself. Seamless switching between smart devices. Features a lightweight, comfortable, and foldable design.