Feature:1. Multi Purpose: Stirling engine model kit has a wide range of applications, such as children's science projects, holiday gifts, physical machine learning tools, teacher demonstration props in the classroom, etc.2. Smoother Operation: There are 4 anti skid pads on the bottom of stirling scientific physical model to ensure smoother operation with low noise, low pollution and low running cost.3. Simple to Operate: Stirling scientific physical model is durable, fill the inflamer with 95% alcohol and light it. Let the light burn on the cylinder at the rounded end for about 60 to 120s, push the wheel lightly and it will work.4. Strong Practicability: Stirling engine motor 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 fundamentals of an external combustion engine and makes a great gift for family and friends.How to Use:1. Read the instruction user manual.2. Check the airtightness of the machine and the glass breakage: the glass tube is not damaged, turn the big wheel, and the resilience is good.3. Light the alcohol lamp, preheat the tube for about 20s (very important), turn the big wheel, and the engine will work.Specification:Item Type: Stirling Engine Motor Model Educational ToyMaterial: Zinc Alloy,Stainless Steel,Glass,LogColor: Mirror,SilverProduct Size:Approx. 160 x 85 x 95mm / 6.3 x 3.3 x 3.7in(Manual Measurement Error is About 1cm)Output Voltage: 3.0-5.0