The Stirling engine model is a assembly version, you need to DIY assembly by yourself, with complete spare parts, simple structure and easy assembly. The Stirling engine is equipped with a small motor and light-emitting diodes, and the magical energy conversion process can be observed.High-quality: Selected high-quality metal materials, golden appearance, exquisite workmanship, high-precision coordination of various parts, stable and firm base, beautiful and durable cold and hot cylinders, and pistons are not easy to wear under high-speed operation for a long time.Usage: The product comes with assembly instructions drawings and installation tools, please refer to the instructions for DIY assembly. Place the assembled Stirling engine model on a horizontal table, add about 2/3 of the alcohol to the alcohol lamp, ignite the alcohol lamp and place it under the heating cylinder to preheat for 30 seconds, turn the flywheel by hand to help start, so that the diode glows.Reminder: Use 95% alcohol (self-provided) for fuel, and use pencil lead to smear the piston for lubrication. Do not add water, kerosene, gasoline, lighter oil, liquor, etc.Significance and Value: By assembling the Stirling engine model, you can exercise your hands-on ability, observe the engine operation and power generation process, and understand its structure and principle. It is entertaining and entertaining, you can do scientific and technological experiments, increase your knowledge of physics, and increase your interest in learning. It can also be used as a decoration with collection value.For Age: 8+Colour: goldenMaterial: metalSize: about 18x9x13cmPackage Contents:1 * Stirling engine model kit1 * Alcohol lamp (not include alcohol)1 * LED lamp1 * Heating glass tubeOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. If you have any questions, concerns, or need further information, please feel free to contact us anytime. Our team is dedicated to providing you with support and answering any inquiries you may have. Your satisfaction is our ultimate goal. We look forward to offering you top-quality products and service! Thank you for your support._x000D_