Snap Circuits Green Energy is an exploration in alternative energy. With more than 125 projects and over 45 parts, you'll build windmills, solar light clock, an electric car, water timer and so much more! This is a fun way to use and learn about gears, using a hand-crank for power, and a meter for watching how much power is being used. Details: Multicolor 15.5" x 2.5" x 12" Over 45 parts included Makes more than 125 projects STEM learning For ages 8 and up