Note: The color of the product we ship is the color in the first picture, and the specification and quantity are shipped according to the quantity and specification described in the title. If you need to change the color or style, you need to contact us within 12 hours after placing the order. Our product DIY Wind Turbine Generator Model Science Education Experiment Physical Teaching Tool Creative Toy- Good choice for teaching physical DC wind power generation principle. Specification:Rated Power: 0.1(W)Output Voltage: 5(V)Wind Wheel Diameter: 0.055(m)Blade Quantity: 3PcsRated Wind Speed: 3.3(m/s)Finished Product Size(LxWxH): 95mmx75mmx120mmBattery: 3 Sections AA Battery(not included) Product Features:1. The model is packaged by completely accessory sets ,you need to assemble by yourself ,just enjoy the DIY fun.2. Advanced design ,high utilization rate of wind energy, no matter where the wind blows ,it can be powered by the wind.3. Small size, no noise, good demonstration effect, is a very good demonstration tool for DC wind power generation and DIY science education experiment.4. Great teaching tool to develop children's hands-on ability and develop their interests. Package Included:1 x DIY Assembly Wind Turbine Generator Model Note: Because the model and display effect of the monitor may be different, there may be slight differences in color, and the size is manually measured, there may be an error of 1-2cm, please understand.