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. Features Up to 57H battery life and speed charge (5mins = 3H) For long-lasting fun, listen wirelessly for up to 57 hours and recharge the battery in as little as 2 hours with the convenient Type-C USB cable. A quick 5-minute recharge gives you 3 additional hours of music. Hands-free calls with Voice Aware Easily control your sound and manage your calls from your headphones with the convenient buttons on the ear-cup. Hear your voice while talking, with the help of Voice Aware. Multi-point connections Allows you to effortlessly switch from one Bluetooth® device to another. You can simply switch from a video on your tablet to a call on your mobile phone, so that you’ll never miss a call. Lightweight, comfortable and foldable design The lightweight materials and soft ear cushions with a padded headband make the headphones comfortable to wear for extended periods. The foldable design makes it convenient for you to carry your headphones anywhere and anytime you want music. Ask Siri or Hey Google Siri or Hey Google is just a button away. Activate the voice assistant of your device by pushing the multi-function button.