4M Kidzlabs Wind Turbine Construction Kit With this set you can make light in the dark. Build the wind turbine and use it to light up one light. The set has detailed instructions to help you during construction. Without batteries, your windmill generates enough energy to light up an LED light when the wind blows! Place your windmill outside when it is dark, for an extra fun effect. Specifications: Color: multicolor Material: plastic Gender: junior Diameter rotor blades: 34 cm Suitable for children from 8 years.