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Generator Model: This is a set of materials for small science and handicraft models. It includes various accessories such as a generator, an electric motor, a large light bulb and so on. It can be assembled to make a generator. The principle is based on the law of conservation of energy. The battery drives the electric motor, and the electric motor drives the generator, which then generates electricity to light up the bulb. Each material is genuine. It adopts a high-power special 280 motor and a 5V 5-watt large light bulb. It's fun and interesting. This product does not come with batteries. It uses AA batteries, which need to be purchased by yourself.