Function: 1. Universal: Stirling engine model kit ma a wide range of applications such as children's science projects, Christmas gifts, physical machine learning tools, classroom teacher demonstration props, etc. 2. Smooth operation: There are 4 anti-slip pads on the bottom of the scientific stirling model, which ensure smoother operation with low noise, low pollution and low operating costs. 3. Easy to use: Stirling scientific physical model is durable, fill the igniter with 95% alcohol and light it. Let the light burn on the cylinder at the rounded end for about 60 to 120 seconds, push the wheel slightly and it will work. 4. High practicality: Stirling engine model is a model for physical experiments, glass tubes and glass alcohol lamps are convenient for direct observation of piston movement. 5. Practical gifts: The Stirling engine model is a well-designed mechanical toy that nicely demonstrates the basics of an external internal combustion engine and makes a great prezent for family and friends. Specification: Item Type: Stirrling Motor Model Engine Educational Toy Material: Zinc alloy, stainless steel, glass, log Color: mirror, silver Product Size: Approx. 160x85x95mm/6,3x3,3x3,7 inch (manual measurement error is about 1 cm) Output voltage: 3.0-5.0 V Fuel: 95% alcohol List of packages: 1x Stirling Engine Model Engine Educational Toy 1 x Alcohol Cover 1 x User Manual 1 x alcohol dropper (3 ml) 1 x Spare Heated Glass Tube 1 x Lamp Beads 1 x Rope Note: The manual measurement error is about 1 cm. 1. Read the instruction manual. 2. Check the tightness of the machine and glass breakage: the glass tube is not damaged, turn the large wheel, and the elasticity is good. 3. Light an alcohol lamp, warm up the tube for about 20s (very important), turn the large wheel, and the engine will work.