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The JBL Tune 520BT Wireless Bluetooth Headphone uses the newest 5.3 BT technology to provide a strong JBL Pure Bass sound. These headphones are simple to use and deliver up to 57 hours of pure pleasure as well as an extra 3 hours of battery life with just 5 minutes of charging. Download the free JBL Headphones App to personalize your sound with the EQ, while Voice Prompts walk you through the capabilities of the headphones. The easy button control allows you to manage calls, sound, and volume from the earcup. If you receive a call while watching a video on another device, the JBL Tune 520BT Wireless Bluetooth Headphone smoothly switches to your mobile device, ensuring that you never miss a call. It folds flat in your backpack and is lightweight and comfy even after hours of listening. Warranty 6- Months