R4 DS Card is made by http://www.r4ds.me. It is the most popular flashcard for Nintendo DS. with a R4 DS and MicroSD card, users can play games, music, movies without any other accessories. How ever, R4 DS card has 2 limitation: it only support MicroSD card up to 2GB and it can't support DSi / 3DS console. So the R4 DS card only fit Nintendo DS console.