yea what the hell is a R4
Okay, it seems I need to inform you on what an AR is then...
Link
That is the link to the info on the product. But simply put it is a game cartridge that looks like a DS game except you can slip into the cartridge a memory card inside of it and put any DS game on there for FREEE. Simply download the ROM game off the web and place it on the memory card. Place the memory card inside of the R4 cartridge and whalla, the game will now be on your DS. Now you might not be able to get every DS game that is out there since you are getting it for free, but I thought it was a worthy investment.