Finis Duo Underwater MP3 Player (Black/Acid Green) with Ear Plugs Bone conduction audio transmission amazingly clear sound in the water Supports MP3 and wma audio formats compatible with iTunes 4GB of storage stores approximately up to 1000 songs or 60 hours of playback Waterproof to 3 meters and 30 minutes Integrated Clip design secures the device to goggle straps