R4 card is a fantastic slot-1 flashcard, which is same size as original DS cartridge. It can simulate original cartridge to work on Nintendo DS console. With a R4 card, users can play free games, listen music, watch TV, read E-book and more. While we talk about R4 card, we special mean the R4 card for DS console. For DSi/DSiLL or 3DS/3DSLL console, please buy R4i 3DS card instead.