NOTE: If headset is too tight we suggest placing them over a ball or something of similar size/shape. Leave undisturbed for at least 24 hours. Repeat if necessary. Please also try length adjustments of either earpiece until both sides best fit you. JBL Pure Bass Sound: The JBL Tune 520BT features the renowned JBL Pure Bass sound, the same technolgy 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: 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. ⚡ Specifications Brand: JBL Model: JBLT520BTBLU Color: Black, Blue, White, Purple Product Dimensions: 26 x 23 x 26.5 cm; 2.3 Kilograms Batteries: 1 Lithium Polymer batteries required. (included) Compatible Devices: Cellphones, Tablets, Laptops Mounting Hardware: 1 x JBL Tune 520BT headphones 1 x USB-C Charging Cable 1 x Warranty Microphone format: with microphone Battery cell composition: Lithium Ion Special Features: Foldable Headphones form factor: On Ear Batteries Required: Yes Cable feature: Without Cable Connector Type: Wireless Material: Plastic Form Factor: On Ear Includes Rechargeable Battery: Yes Manufacturer: JBL Country of Origin: India Power Source: Battery-Powered Batteries Included: Yes Item Weight: 2 kg 300 g