Features: Principle of Operation: A Stirling engine is a heat engine that operates by cyclic compression and expansion of air or other gas (the working fluid) at different temperatures, such that there is a net conversion of heat energy to mechanical work. Teaching Tool: Aerodynamics are rich in knowledge of physics, single cylinder combustion engine. Engine principle is intuitive, educational toys, teaching experimental equipment can effectively cultivate children's interest in learning can also be used for classroom teaching, more intuitive and easy to understand. Wide Applications: People bought it for kids' science project, physics, mechanics learning, demonstration on class, etc. Artwork: With elegant design and fine workmanship, this is a beautiful piece of art. Features: As the external combustion engine, it avoid the explosion risk when traditional internal combustion engine working, in order to achieve a high efficiency, low noise, low pollution and low operating costs. The biggest advantage of the external combustion engine output and efficiency from the influence of altitude, very suitable for high altitude areas. Easy Operate: Fill the alcohol burner with your 95% alcohol (we recommend this fuel) and light it. Let the light burn the round ended cylinder for about 60 seconds, then give the wheel a gently push, it will run like a charm. Note: Please use this product in the company of parents and teachers. Specifications: Item Type: Stirling Engine Model Material: Zinc Alloy Color: Golden+Silver Size(L x W x H): About 165 x 87 x 95mm/6.5 x 3.43 x 3.74inch Package Includes: 1Pc x Stirling Engine Model 1Pc x Alcohol Burner(not include alcohol) 2Pcs x Heating Glass Tube 1Pc x User Manual Operation Steps: 1. Read the instructions. 2. Install the product, push the flywheel for test operation, ensure adjusting the position of accessories and smooth operation. 3. Light the alcohol lamp, preheat 60s, and rotate the flywheel. 4. Product operation. Notes: Transition: 1cm=10mm=0.39inch 1. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! 2. Please allow 1-3cm measuring deviation due to manual measurement.