JBL Tune 520BT Wireless On-Ear Headphones, Pure Bass Sound, 57H Battery with Speed Charge, Hands-Free Call + Voice Aware, Multi-Point Connection, Lightweight and Foldable , JBLT520BTBLKEU About this item [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. The JBL Tune 520BT utilizes the renowned JBL Pure Bass sound, the same technology that powers the most famous venues all around the world.