New, still in original packaging Sony WF-3500 Earbuds. Specifications & Features Discover the freedom of Bluetooth® connectivity with our compact WF-C500 truly wireless Bluetooth® earbuds. Combining high quality sound with long battery life, sound customisation, ease of use, and water resistance for go-anywhere music entertainment. DSEE™ restores high frequency sound and fine fade-out sound lost in compression Fine-tune your sound using the Sony | Headphones Connect app 10hr long battery life, total 20hr with charging case4 Splash-proof and sweat-proof with an IPX4 rating Optional use of one earbud only