Kidszlab Green Science Windmill Generator. With 4M Kidzlabs Green Science - Windmill Generator you can make light in the dark with the help of wind! A super fun way to learn more about generating light through wind power. You only need to recycle a plastic bottle and you can start the project, batteries are not required. Build your own windmill and learn all about wind energy. Recycle a plastic drinking bottle, assemble all the parts and your windmill generator is ready. The tail ensures that the screw of your windmill always stays in the wind direction. Fill the bottle with water for more stability. Place your generator outside on a flat surface, or partially bury the bottle in the ground in strong winds. Be amazed by the result. Without batteries, your windmill generates enough energy to light an LED light when the wind blows! Place 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 aged 8 and over. - Length: 13 centimeters - With detailed instructions NOTE: this is the French version.