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