Usage Tips:- Scientific Experiment ModelThe Hydroelectric Generator can attract children's interest in science, exercise children's hands on ability and thinking ability, and learn basic physical and scientific principles. - Easy to AssembleScience physical experiment toy needs to be assembled manually, kids can assemble it with their family, bringing a fun and easy assembly experience. - DurableThe Hydroelectric Generate Electricity Model DIY Kits is made of quality material, durable for a long time. - UsesScience toy can be used as teaching models, science competitions, scientific experiment models, educational assembling toys, etc. - Great Gift IdeaThe Education toy is both fun and educational, making it the perfect gift for kids and lovers who love to build toys. Size Chart: 15cmx12cmx12cm/5.91inchx4.72inchx4.72inch Package Includes: 1 Science Experiment Model Note: Please allow slightly errors due to manual measurement and different monitors.