This motorized set is compatible with all the Georello line. It includes a new motor unit that has two controls: a large turning knob with three positions to determine the direction of rotation (forward, reverse, neutral) and a second large knob that works as a manual accelerator, determining the speed of rotation, from slow to very fast motion. This set includes six gears in three sizes and six interlocking plates. It also includes a booklet that shows how to integrate the motor unit into all the other Georello sets.