Don't let a low battery kill your song - and your mood. You can listen for up to 25 hours with the Sony WI-C100 Earphones - plenty to see you through from work to workouts. And if they're running low, a quick 10-minute charge will give you an hour of playtime.Good to know- Sony's Digital Sound Enhancement Engine (DSEE) makes music sound more natural- Tweak the audio just the way you like it with presets and EQ in the app- Tuned for balanced sound through the low and high frequencies with clear vocals- IPX4 water resistance means you can wear them in the gym