JBL Pure Bass Sound The JBL Tune 520BT utilizes the renowned JBL Pure Bass sound, the same technology that powers the most famous venues all around the world. Wireless Bluetooth 5.3 technology Wirelessly stream high-quality sound from your smartphone without messy cords with the help of the latest Bluetooth technology. Customize your listening experience Download the free JBL Headphones App to tailor the sound to your taste with the EQ. Voice prompts in your desired language guide you through the Tune 520BT features. Up to 57H battery life and speed charge (5mins = 3H) For long-lasting fun, listen wirelessly for up to 57 hours and...