Take open-ear listening to new depths. OpenSwim (formerly Xtrainerz) is engineered with Shokz’s signature open-ear design and 7th generation bone conduction technology to ensure bud-free, comfortable listening all day, in or out of the water. OpenSwim is completely waterproof and submersible, and features four gigabytes of MP3 storage, enabling athletes to train harder; no wires, no devices, no limits.Key Features:Internal Music Storage Only,Not Bluetooth Compatible , IP68 Waterproof , 8-Hour Battery Life,Comfortable Under Swim Cap Comfortable Under Swim Cap.Designed For SwimmersEngineered to withstand all elements. OpenSwim is fully waterproof and submersible so you can swim, run, cycle, or train harder than ever before.Open-Ear ComfortOur open-ear design powered by bone conduction technology ensures bud-free, comfortable listening all day, in or out of the water.IP68 WaterproofOpenSwim has an IP68 waterproof rating and can be submerged in water up to two meters deep for up to two hours.4GB Of MP3 StorageInternal music storage allows for a library of up to 1,200 songs ready to play at the touch of a button. Supports MP3, WAV, WMA, AAC, and FLAC for device-free listening. Not Bluetooth compatible.8 Hours Of MusicWith 8 hours of battery life and easy commands such as play, skip, pause, and back-a-track, you can enjoy your music lap by lap.How To Upload Audio Files To OpenSwimOpen the USB charging cradle, insert your OpenSwim into the charger, and close.,Plug the USB end into your computer (an OpenSwim drive will pop up),Drag and drop your fave audio files into the drive,What's In The BoxOpenSwim MP3 Headphones,USB Charging Cradle,Swimming Earplugs,Silicone Rubber Carrying Case.