Soup up your mega marble run and automate your track with our “GraviTrax Power Starter-Set XXL”! Eight Power accessories link via radio; as one marble finishes the race, another is signaled and sent on its way. Or use the remote control and take charge. Set includes the Power Trigger, Lever, Elevator and Switch to create buzz-worthy, customized marble runs. Easy to connect and compatible with all other GraviTrax construction sets. Boost the power of gravity and educational fun today!