See for yourself how a generator works with this hands-on alternative energy kit. Use this kit to build a 5 inch windmill generator with an LED light-bulb. This windmill generator can be used in or outdoors. Just provide a recycled soda bottle. Instructions and a renewable energy fun facts pamphlet are included. Encourages children to explore, understand and be inspired by the world of science, technology, engineering and math. Learn about renewable energy.