SHOKZ OPENSWIM HEADPHONES (model S700) NWB Designed For Swimmers Engineered to withstand all elements. OpenSwim swimming MP3 are fully waterproof and submersible so you can swim, run, cycle, or train harder IP68 Waterproof OpenSwim swimming MP3 has an IP68 waterproof rating and can be submerged in water up to two meters 4GB Of MP3 Storage Internal 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. (NO BLUETOOTH) What's In The Box OpenSwim MP3 Headphones USB Charging Cradle Swimming Earplugs Silicone Rubber Carrying Case