Truly wireless design Just your music with no wires to get in the way. Secure and comfortable fit Extensively tested in real workouts, these headphones have a secure fit that you can adjust to your ears. The soft-cushioned arc supporter and three-dimensional curved design ensure a secure, comfortable fit, so when you move, your headphones don't. Get deep in the zone with digital noise cancellation Cue up your workout playlist, and get in the zone. The digital noise cancelling technology reduces ambient sounds of the gym and your surrounding environments, leaving just you and the music. Long battery life plus quick charging At a full charge, the headphones offer up to 9 hours of power, while the handy charging case provides extra 9 hours. That's up to 18 hours of noise-free listening.With noise cancelling switched off, it's even longer - up to 13 hours of power on a full charge, with extra 13 hours provided by the charging case, for up to 26 hours of play time.And if you're in a hurry, 10-minute quick charging gives you up to 60 minutes of music playback with noise cancelling. Sweat- and splash-proof The tough workout never stood a chance. With an IP55 rating, the headphones can handle sweat or splashes from rain when you're working out. Bass that moves you The WF-SP800N sport earbuds feature EXTRA BASS for seriously powerful, punchy low-end sound. Your favorite bass lines never sounded so good.