This simple, easy to use accessory allows you to enjoy up to 1200 of your selected songs with a 4GB Micro SD HC memory card*, while on the move. Play/Pause, Forward/backward and Volume control buttons located on the front of the MP3 player means you can listen to music while playing games. *MP3 files are transferred via a PC onto a Micro SD / Micro SD HC card. The card reader and the SD memory card are to be purchased separately. The memory card is then inserted into the Nintendo MP3 Player cartridge. The maximum capacity you can use in this device is 4GB.