As the model is packaged by completely accessory sets you need to assemble by yourself just enjoy the DIY fun . Advanced design high utilization rate of wind energy no matter where the wind blows it can be powered by the wind. Manufacturered by Keproving. Small size no noisegood demonstration effect is a very good demonstration tool for DC wind power generation and DIY science education experiment. Great teaching tool to develop children's hands-on ability and develop interests. Good choice for teaching physical DC wind power generation principle.