It pretty much puts a microSD card slot on your DS. There's no firmware updating or anything, it's all plug and play. You pop an SD card into the R4, which plugs into the DS gameslot, and the DS reads it. On those microSD cards you can put games n shit. I have about 900 DS games, and about 40+ on my 2gb microSD card right now. I have another one with movies on it too, bunch of comedies.
R4 is just the shit, heh.
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