A handson science kit that lets children build a working elevator model and learn basic mechanical principles. Designed for ages 5 to 12, this DIY elevator kit is suitable for home learning, classroom demonstrations, and afterschool projects. Key benefits Encourages STEM learning through active building and experimentation. Demonstrates mechanical concepts such as gear transmission, lift and descent, and simple machine operation. Easy assembly provides a rewarding building experience that develops fine motor skills and problem solving. Durable KT board construction offers a smooth, lightweight structure that withstands repeated use. Main features Functional simulation: model reproduces elevator lifting and lowering actions so children can observe motion and causeeffect relationships. Educational design: the kit highlights gear transmission and mechanical linkages to support lessons in mechanics and physics. Easy to assemble: components are packaged for straightforward DIY construction, suitable for independent or guided assembly by children and teens. Material: made from KT board, which is lightweight, has a smooth surface, and resists damage during normal handling. Learning outcomes and practical value Teaches how gears convert rotational motion into linear movement and how simple machines work together. Builds sequencefollowing, handeye coordination, and basic engineering thinking as children follow steps to assemble and test the model. Suitable for demonstrations, repeat experiments, and group learning activities. Use scenarios Classroom science lesson: use the model to demonstrate gear ratios and transmission during a physics or technology class. Science fair or school project: assemble and present the elevator model to explain mechanical principles and construction steps. Home STEM activity: a parent and child can build the kit together, then test and modify the model to explore how changes affect movement. This kit provides a clear, handson way to explore mechanical systems with materials and assembly appropriate for children aged 5 to 12.