Sound Quality - DSEE restores high frequency sounds lost in compression Battery Life - Up to 10hr battery life, total up to 20hr with charging case Ratings - Splash-proof and sweat-proof with an IPX4 rating Built-In Mic - Easier, clearer hands-free calling Comfort - Small and light for a great fit and all day wear Design – Ergonomic Surface Design for Secure fit Portable - Go anywhere with pocket-sized case Easy button operation - WF-C500 Earbuds not only let you play, stop or skip through tracks and adjust the volume