Jumpers actually. Two sets, one selects nich/lipo the other changes the breaking. (I think) I'm very new to this. The only switch is on/off. I wish there were some way to dampen the throttle for beginners. I know the kit form is much more "adjustable" but I figured RTR was my best be as it can still be tweeked. You can lengthen the links and drive shafts to make it work with longer bodies, or shorten it. Pretty much, the sky is the limit. Or your bill fold.