Its a save state accessory, you can basically get to the point in any game and then hit a button confirgurariton like down and A at the same time and it will save your state. then hit like up and B at the same time it will load it exactly where you saved. Comes in handy on those nearly impossible to beat nes games. I used it on battletoads and ALMOST beat it LOL, still couldnt get through the freakin wheel bar things lol. But yea theya re sweet and work kinda like a game genie, game goes in the top and put it in your NES. will only work on the toaster NES i believe cause you actually have to remove the metal bar in your NES to get it to fit. Very cool.

-Mark