FINIS Duo Underwater Bone Conduction MP3 Player Bone conduction audio transmission amazingly clear sound in the water without the Use of ear buds Supports MP3 and wma audio formats compatible with iTunes; listen to music, audiobooks, podcasts and more 4GB of storage stores approximately up to 1000 songs or 60 hours of playback Integrated Clip design secures the device to goggle straps to rest on the cheekbones for a comfortable and streamlined fit Waterproof Ipx8 to 3 meters and 30 minutes sound is clearest when submerged in water.Please refer user manual attached below for instructions and troubleshooting steps. The improved charging docks have a silver, circle-shaped magnet