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Environmentally friendly power sources will definitely ignite children's interests in science. Green science kits demonstrate the basic principles of electricity and mechanics in a safe, fun and imaginative way.Build this amazing Windmill Generator and learn about renewable energy. Watch the LED glow as it is powered by free energy from the wind. No batteries required!Contains rotor, front housing with gear and rotor shaft installed, back housing, 2 half screw caps, toy motor with gear (generator), motor cover, 8 small screws, LED with wires and detailed instructions.