>>31339600It's a second analog stick introduced in the newest iteration of the 3DS.
Unmodified, it's pretty bad. It doesn't actually move (or at least, you can't feel it move) so there's no feedback outside of what you can see in-game. To make things even worse, it has no grip so using it for more than 20 minutes makes it slick as fuck and basically unusable. Lots of people have been replacing them with the PSP 1000 pad, myself included.
It's also very unused, I can only think of a handful of games that actually use them and most of them just treat it as another d-pad (no analog controls, because it's impossible to use).
