💎Interesting assembly to stimulate interest. Improve children's practical ability, learn and understand the principles of mechanical transmission and connecting rod transmission. 💎The built-in 3.3 million super capacitor can store electricity to drive Tanyang energy and dry battery. It can be operated day and night. It is more convenient for children to understand the conversion and storage of electric energy. 💎The front and rear limb activities are designed with biomimetic concept, with real image. 💎Worry free installation is equipped with installation tutorial app 3D digital manual. Each step is easy to install.