Feature: 1. Strong Power: Through the hand crank turning the large disk to drive the generator rotation, to realize the output of electricity to light up the light bulb. 2. Exquisite Craftsmanship: These 3D wooden puzzles are made of safe wood with precise pre cutting, and the edges of each component have a smooth finish can be tightly integrated. 3. Educational Toy: By assembling these building kits, children can develop their hand eye coordination, stimulate their imagination and promote their physical and intellectual development. 4. Unique Design: Interesting science education work perfectly demonstrates the function of hand cranked power generation, and can also demonstrate the effect of cell phone charging(low current, can't actually charge). 5. Scientific Learning: The hand cranked generator model allows children to learn about the principles of power generation and the scientific knowledge of energy conversion, stimulating their interest in science. Specification: Item Type: Wooden Generator ModelMaterial: Composite woodUse: Handmade, educational teaching . Package List: 3 x Wooden Board1 x Motor1 x Light Bulb1 x Belt1 x Module1 x Bushing2 x Bearing2 x Gear2 x Wire1 x Soft Cushion12 x Screw