Marble run track Excellent condition. Automate your marble run and send those spheres racing via radio signal and remote control with our “GraviTrax POWER Launch Starter-Set”! Launch your next marble automatically with the “GraviTrax POWER Starter-Set”! The POWER Starter and Finish are linked via radio signal; as one marble finishes the race another is sent on its way! Or, use the POWER Controller to be in charge! Easy to connect and build, the set includes POWER accessories to create buzz-worthy, customized marble runs, completely compatible with all GraviTrax sets. Now you can control the marble by programming the electronic elements, that communicate through invisible connections created by players controller. The GraviTrax interactive track system allows you to design and build your own race tracks and experiment with gravity, magnetism, kinetics and now POWER your marbles to the finish.;The Gravitrax POWER Starter Set Launch requires a total of 4 AAA batteries, these are not included in the package. Rechargeable batteries can be used GraviTrax is an an ideal holiday and birthday gift for creative, curious kids who love to build.