4M Kidzlabs wind turbine kit Using this set make light in the dark. Construction of the wind and use it to light a lamp. The set has detailed instructions to help you during construction. 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 an extra nice effect. specifications: Color: multicolor Material: Plastic Gender: junior Rotor blades Diameter: 34 cm Suitable for children over 8 years.