Let children build their own roller coaster with K'NEX Clock Work Roller Coaster Building Set. It is a motorized roller coaster that brings the exciting amusement park experience to your home. A clock hand is positioned at the face of the toy. This engineering set is fully functional - the hour hand lifts the car upward on the 2.6-feet-high track and lets it go once it reaches the top, where it rolls through the twists and turns with gravity-defying ease. The K'NEX toy set contains 305 K'NEX parts, including rods, connectors, a roller coaster track, a red coaster car, and a motor. The pieces connect together to create a fun and engaging roller coaster ride. It requires 2 AA batteries to operate, which are not included. If you want to build a complete amusement park, collect the K'NEX Infinite Journey Roller Coaster Building Set and the K'NEX Revolution Ferris Wheel building set - both sold separately - and build them side by side, then watch the park roar to life. Age:7+ years.