Description: Solid material: The engine model set is made of metal, durable and safe, and can be used for a long time. Scientific experiment: Educational scientific model is a vivid model to show the basic principle of external combustion engine and learn the principle of energy transformation. Easy to use: The engine model can light the color LED on the generator, and the generated power can also be used to power other equipment. Wide use: The engine model can be used for teaching props, to help students learn the work principle. Perfect gifts: Educational science model engines are practical birthday and holiday gifts for teacher, adults, kids and children. Specification: Output voltage: 3-5V. Size: Approx. 16.5x9.5x12.5 cm/6.50x3.74x4.92 inch. Material: Metal. Fill the lamp with 95% wine to heating the metal cylinder; Then, after warming up for a few seconds, let the freewheel rotate, and it will rotate quickly and smoothly. It will light the color changing LED bulb installed on the small generator. Note: There might be a bit color distortions due to different computer resolutions. There might be a slight errors due to different hand measurement. Package Includes: 1 Set Engine Model(with 1 Piece Night Light).