Open-Ear Listening Our open-ear design powered by bone conduction technology ensures bud-free and comfortable listening all day, in or out of the water. Bone Conduction Technology Equipped with the patented PremiumPitch™2.0 bone conduction technology, OpenSwim (Formerly Xtrainerz) achieves 50% less sound leakage, and provides extraordinary underwater sound quality. IP68 Waterproof An IP68 waterproof design withstands total submersion in up to 2 metres of water. It’s fully waterproof and submersible so you can swim, run, cycle, or train harder than ever before. 8-Hour Battery Life Designed to go the distance. Powerful battery enables a premium audio experience for up to 8 hours. 4GB of MP3 Storage Built-in storage allows for a library of up to 1,200 songs, ready to play at the touch of a button, enough to store all the music you enjoy. Versatile And Secure Fit Compatible with swim caps, goggles and earplugs. OpenFitTM titanium design equipped with wraparound flexibility for reliable stability in any situation. Built-In MP3 Headphones It supports MP3, WAV, WMA, AAC, and FLAC for device-free listening. Music Shines Underwater Experience underwater music like never before