Hot Wheels Track Builder Rev 'n Launch Challenge brings the fast action to everyday play. Crank & boost to launch and measure your speed! Kids test and improve their skills when they launch their car and hit measurable top speeds. Playing with this set with a friend fosters the competitive spirit for hours of play. Connect the launcher that's also a kid-powered booster and the speedometer anywhere in other sets for even more epic challenges and builds! CONTENTS: 1 Track Set, 1 Vehicle.