Open-ear comfort OpenSwim bone conduction waterproof headphones don't go in or over your ears, you can say goodbye to ear infections and ear pain. Feather-light at just 30g lets you forget you're wearing them when swimming and exercising. Designed for Swimming An IP68 waterproof design allows the swimming MP3 player to withstand total submersion in up to 2 metres of water. Crystal Clear Sound Boosted by 7th generation bone conduction technology, OpenSwim waterproof headphones SOUND BETTER UNDERWATER, even with loads of noise from the waves or shouting at the pool. Secure Fit With titanium wraparound design, OpenSwim waterproof headphones stick to your head even when tumble-turning and fast swimming. Compatible and Versatile Compatible with swim goggles, cap, and earplugs. OpenSwim bone conduction headphones are also ideal for other exercise, not just water, but hiking, working out, TRX, etc, and any time you want to train without your phone - just give it a try! 8-h usage & 10-day standby Crush your battery anxiety. No need to worry about long training sessions and travel. 4GB Built-in storage Allows for a library of up to 1,200 songs, enough to store all the music and audiobooks you enjoy. OpenSwim bone conduction waterproof earphones support MP3, WMA, AAC, WAV, FLAC AUDIO formats. Intuitively-designed button for easy controls Manage your controls with an easy to locate and use button, adjust the volume, choose tracks, pause and skip and switch from"general" to "swimming" EQ mode.