The waterproof headset has a built-in MP3 player that uses up to 8G Micro SD cards (holds 1600 songs). A card reader is included to easily download and play music. The player features: last song memory/sleep mode, shuffle, stop/pause,next song, previous song, vol +/-, includes USB cable, 512 micro SD card (100 songs), docking station and rechargeable lithium ion battery. Package includes 3 sets of ear buds- small medium and large to ensure ear buds fit properly into ear. The ear piece is adjustable so ear bud can easily be aligned in the proper position for different size ears. The headset is soft and flexible for a tight comfortable fit. The MP3 player secures low on the back of the head so a helmet can be worn with headphone. Jump shake, roll, swim, surf, ski and the headphone/player does not move. There are no exposed wires, all wires are concealed inside headphone for ease of operation. This also reduces any potential function problems from wires being caught or pulled on. The MP3 player is removed from headset for charging. To charge it snaps on to a docking attachment which plugs into USB port for charging. Docking station also has a jack for remote speakers.