Slot 1 devices are things that go in the DS card slot and slot 2 devices are things that go in the gameboy slot. Rumble RAM packs are like a normal rumble pack but with built in RAM. RAM pretty much makes games and other stuff on the slot 1 card run faster. For example if you were playing a game that was lagging a bit (doesn't happen to me) the ram would probably speed it up. I wish I had brought mine with a ram pack because my ds lags and freezes when I play movies. The gba expansion pack is the same thing as the ds card except it can play gba games and homebrew. The ds card can't play gba games without a gba expansion pack. I've heard about emulators lagging a lot so I would go with the ram pack or the ram+gba if your want to play gba games. If you just want to play ds stuff, go with the ram pack.
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