DSEE restores high frequency sounds lost in compression,Up to 10hr battery life, total up to 20hr with charging case,Splash-proof and sweat-proof with an IPX4 rating,Easier, clearer hands-free calling,Small and light for a great fit and all day wear.Ergonomic Surface Design conforms to most ear shapes.Fine-tune your sound using the Sony Headphones Connect app.Optional use of one earbud only.Easy button operation to take control without your phone.Experience 360 Reality Audio for a truly immersive experience