Specification Finished product size: 120 mm * 120 mm * 200 mm Motor diameter: 24 mm Motor height: 31 mm Output shaft diameter: 2.0 mm (The length of the shaft varies from batch to batch, about 12 to 15 mm) Total diameter of the fan blade: 120 mm Total height of the fan blades: 30 mm Diameter of fan blade: 1.95 mm (can be closely combined with a 2 mm shaft) Feature -The product is a bulk kit that you need to assemble yourself when you buy it back.It comes with installation instructions.It is an educational toy for learning physical knowledge in DIY handwork process. -Do-it-yourself installation of a wind turbine, promote practical skills, is a very good parent-child educational learning toy made by hand with children. Turbine blade wind turbine DIY manufacturing model, the wind blows the windThe rotation of the blade drives the micro DC generator to generate electricity, which lights the matching LED. -Turbine blade design, the efficiency is higher than other blades. Note: LED bulbs with 5V need a little more wind. Package include: 1*Mini Wind Generator DIY Teaching Model Kit.