Features: Similar to the working principle of internal combustion engines: Burning alcohol lamps provide power heating to expand the internal gas, thereby increasing the power of the internal molecular gas to act on the flywheel. With the help of the flywheel, thermal energy will be converted into mechanical work. Through hands-on operation, you can observe the entire process of Stirling engine operation, more intuitively understand the working principle of stirling engine, and deepen your interest in physics. The product has been assembled and can be used directly. Superior stainless steel structure, rugged and durable to use. An ideal choice as a gift for friends, kids, family and more. Specification: Condition: Brand New Item Type: Stirling Engine Material: Stainless Steel Color: As picture Package List: 1 x Stirling Engine with LED Light 1 x Sponge 1 x Alcohol Cylinder 1 x Quartz Tube with Iron Wire Note: Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. .