3 Kidzlabs 4M wind turbine kits. Thanks to this set, you make light in the dark. Build the wind turbine and use it to turn on a light. The set contains detailed instructions to help you during the construction. Without batteries, your wind turbine generates enough power for the LED indicator to light up when the wind blows Place your grinder outside when it is dark, for a very pleasant effect. Diameter of the rotor blades: 34 cm. Suitable for children from 8 years old. 4M is the market leader in educational toys. With the aim of making learning fun, a long work is done to create creative, innovative and quality products.