Many ancient inventions and tools are so wonderful that people will remember them forever. The watermill is surely one of them. It actually still plays an important role in the countries where water resources are rich. Kids learn a lot about science and green energy while building this kit. Science education is not only creative， but also fun. The water mill turns when exposed to sun. Sharpen your brain and build a Solar Waterwheel. It is delivered unassembled in a gift box. Children will enjoy building and playing with it.Scientific Educational DIY Solar Kits---Solar WaterwheelSlight light needed to drive turbineMonocrystalline silicon solar panelPlywood DIY design--no extra tools are needed.Good for the family--fostering children's creativity and love of science. Also， it is good for kindergarten and schools for organizing solar kits competitionsUnit Size: 20.5*17*16 cm (finished product)