Crab Kingdom DIY Children Science Technology Experiments Classroom Small Inventions Assembled Models Toys Educational Learning Tool Kit-Hydroelectric power generation This small science experiment model, about a physics principle, is made by good quality wood and other assembled parts for primary and middle school students or teachers to make the science class more vivid and improving students' experimental operational skills. Features: Easy to assemble and operate, inspire children's interest and curiosity. Stimulating students' creative thinking and ability by learning physics. Help teacher to make the science class more lively and interesting. Small experiments can also consolidate students' mastery of physical knowledge. Great playing model tools, children can DIY colors on. Specifications: Material: wood Suitable Age: 10+ Knowledge Point: gear drive Power: 2 * AA batteries (not included) Item Size: 150 * 100 * 100mm / 5.91 * 3.94 * 3.94in Package Weight: 112g / 3.95ounce Package Size: 198 * 300* 15mm / 7.8 * 11.81 * 0.59in Note:  Please allow 1-10mm error due to manual measurement, thanks for your understanding! Battery is needed but not included in package, you need to prepare yourself! Package List: 1 * Science Model Kit