Features: brand new and high quality This model is used for making all kinds of small technology, model making, etc. Small size and good demonstration effect. It is a good teaching tool for wind power generation. Good choice for teaching physical for DC wind generation principle. As the model is packaged by completely accessory sets ,you need to assemble by yourself ,just enjoy the DIY fun. Small size, no noise,good demonstration effect, is a very good demonstration tool for DC wind generation. In order to improve the display effect ,the for turbine need to be powered by the fan or blow dryer on it at just the right angle instead of the natural wind . Specifications: Material:Metal+ABS Motor Diameter 24.5mm/0.96inches Motor Height 34.2mm/1.35inches Output Shaft Diameter 2.0mm/0.08inches Output Shaft Length 13.5mm/0.53inches Output Voltage: 0.1V-5.5V Package Includes: 1 x Vertical Shaft for DC Wind for Turbine note: Due to the light and screen difference, the item's color may be slightly different from the pictures.Please allow 0.5-2 for cm differences due to manual measurement.