With the GraviTrax® POWER Extension, building a marble run becomes electronic for children ages 8 and up! The electronic elements are connected by radio. As soon as a ball rolls through the POWER Trigger action block, a signal is triggered. The player controls the course of the run with the POWER controller; will it be the POWER Switch, the POWER Target action block, or the POWER Lever that responds to the signal? The electronic elevator automatically raises the balls one level. This generates new energy, and a nearly endless marble run adventure can begin! Contents: 1 instruction booklet, 1 warning booklet, 1 quick start guide, 1 POWER starter block, 1 POWER Target action block, 1 POWER Target arena, 1 POWER Trigger, 1 POWER Switch, 1 POWER Elevator, 1 POWER Lever, 1 POWER controller