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. Item Type: Wooden Generator Model Material: Composite wood Use: Handmade, educational teaching 3 x Wooden Board 1 x Motor 1 x Light Bulb 1 x Belt 1 x Module 1 x Bushing 2 x Bearing 2 x Gear 2 x Wire 1 x Soft Cushion 12 x Screw