Take open-ear listening to new depths. Swim, run, cycle, and train harder than ever before with open-ear headphones that can withstand all elements. Engineered to withstand all elements. Xtrainerz are fully waterproof and submersible so you can swim, run, cycle, or train harder than ever before. Our open-ear design powered by bone conduction technology ensures bud-free, comfortable listening all day, in or out of the water. 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. Not Bluetooth compatible.