Features: 1.The novel design creatively combines the Stirling engine model with the toy car. 2.Stirling engine model provides power to drive the toy car and has a variety of ways to play. 3.The product itself has been assembled and can be used directly, which has a high collection value. 4.Exquisite appearance, fine polishing, not easy to rust and discoloration, with high?end texture. 5.The slot is used to fix ethanol lamp, safe and reliable, and widely used in scientific projects and physics/mechanical learning. 6.By operating engine, intuitively understand working principle of the Stirling engine and deepen your interest in physics. 7.It is also a good class demonstration prop for teacher, suitable for friends, family, children, etc. specification:Item Type: Stirling Engine Material: Zinc Alloy Size: Approx. 15.8x11.4x9cm / 6.2x4.5x3.5in Purpose: Through manual operation, you can observe entire running process of the Stirling engine, understand the Stirling principle more intuitively, and broaden your interest in learning physics Operation Method: Place the model in a horizontal position during the operation, pour ethanol into the ethanol lamp to ensure safety, and then turn on the ethanol lamp. After preheating for 1 to 2 minutes, the lamp heats the piston tube, the dry air expands to generate power, and the car will start moving. (Use 95% ethanol) PackageList: 1 x Stirling Engine 1 x Ethanol Lamp 1 x Ethanol Pad 1 x Screwdriver 1 x Wrench 1 x Tweezer 3 x Elastic String (2Pcs installed on product) Note1.Please allow 0?1 inch error due to manual measurement. Thanks for your understanding. 2.Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.