Now kids will have double the power with the Double Dare Speedway Set. The DARDA system incorporates construction, creativity, action and fun. Powered by the precision engineered Mega Motor, speeds of 500-600 scale mph can be achieved with just one small wind - no batteries, keys, or electricity needed! Boys & girls, start your engines! With Darda's start/win box, kids officiate their own races! After winding the cars into position, simply click the "go" button to start the competition. Set features exciting sharp curves, 360 dgree loops, straight path, and a swiveling checkered flag that signals the winner. No batteries needed to operate, and no tools needed to set up this set. For ages 4 years and up.