Features: brand new and high quality Due to the heat of alcohol, the engine will run frantically and generate electricity. The power will pass through the wires and drive the LED lighting. This is really an interesting and imaginative toy. The engine model is made of high-quality metal and elegant craftsmanship, which is sturdy and durable. Through hands-on operation, you can observe the whole process of the Stirling engine, understand the working principle of the Stirling engine more intuitively, and deepen students' interest in physics. It has a wide range of applications, such as children's science projects, physics/mechanical learning, classroom demonstration props for teachers, friends, family members, parents, children's birthday gifts, etc. The Stirling engine model has been assembled and can be used directly. Specifications: Material: Metal Size: Approx. 12.5x17cm/4.92x6.69inch Package Includes: 1x Stirling Engine Motor Model note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.