Kidszlab Green Science Windmill Generator. Kidzlabs with 4M Green Science - Windmill Generator make using wind light in the dark! A super fun way to learn more about the generation of light by means of wind power. You only have to recycle a plastic bottle and you can start the project, batteries are not required. Build your own windmill and learn about wind energy. Recycle a plastic water bottle, assemble all the parts and you wind generator is ready. The tail ensures that the screw can windmill is always in the wind direction. Fill the bottle with water for more stability. Post your generator outside on a flat surface, or dig the bottle partially into the ground by heavy winds. Be amazed by the result. Without batteries your windmill generates enough energy to light a LED light when the wind blows! Post your windmill outside when it is dark, for more effect. Super nice result! - The dimensions of the box are 17 by 22 by 6 cm. - Suitable for children 8 years and older. - Length: 13 inches - With detailed instructions NOTE: This is the French version.