The Green Science Windmill Generator harnesses the power of the wind on a small scale, and teach tomorrow's engineers. How is energy produced by using windmills? Build this amazing wind generator and learn about renewable energy or "green energy". Watch the LED glow as it is powered by free energy from the wind. No batteries required! Help save the planet by using a recycled plastic bottle to support your wind generator. The Green Science Windmill Generator has a gear motor and propeller with (6) 5-3/8" wide blades and a tail. Minimal assembly is required to mount them on a large soda bottle (easier than building a tower, but you could do that, too) and watch the wind light up the LEDs.

Contain 1 rotor, 1 front-housing with gear and rotor shaft installed, 1 back housing, 2 half screw caps, 1 toy motor with gear (generator), 1 motor cover, 8 small screws, 1 LED with wires and detailed instructions, including "How it works: and fun facts. Windmill generator size at 13cm long.