the game boy advance movie player (gbamp for short) and its included software converts mp3 files to .gbs (game boy sound) and movie and such to .gbm files (game boy movie) in edition to this it uses a common memory that a lot of cameras use a compact flash card which will allow you to store as many movies and songs as the cf card size allows. another cool feature is it allows you to read e-books meaning .txt files while supporting multi tasking which means listening to youre music. it is unable to play gba roms unless they are under 200k but it does play..... famicon roms that you can of course download legally i hope this guide helped oh and also i saw some one selling it for 65$ and let me tell you it is not rare and he is lying! you can get it for 20$ to 25$ thank you and good bye