The hand controller - your tool for the perfect race Make the ideal start, drift spectacularly through the curves and always be on the right track to overtake your opponent - you can do all of this with a bit of tact and your hand controller. As usual, you can fine-tune the speed of the slot car with the top button. The red button on the front allows you to change lanes on your DIGITAL track. The controller is wired, so you don't have to worry about the charge level or batteries.