Features: Well-made Stirling Engine Mode: The whole body is made of high quality aluminum, the surface metal is brushed, CNC high-speed machining. The base is made of high-grade imported beech wood, and there are sponge anti-slip pads at the 4 corners. Great yo decorate your desk. Attractive LED Light: The stirling engine equipped with a LED. As the power will go through the wire and drive the LED light to lit. What an interesting toy. Easy to 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 20 seconds, then give the wheel a gentle push. Superior Performance: When the model keeps rotating, the speed is high, the performance is stable, and the rotation can be maintained for a long time. Great Educational Toy: classroom or laboratory experimental teaching aids, the best choice gift to students, teachers, children, friends and colleagues. Specification: Model: LL-003-PU Main Material: Wood, Aluminum, Metal Output Voltage: 3-5V Size: 16 x 10.2 x 8.5cm/6.3 x 4 x 3.3in Weight: 297g/10.5oz Package Size: 17.8 x 11.6 x 9.5cm/7 x 4.7 x 3.7in Package Weight: 413g/14.7oz Packing List: 1 x Stirling Engine Model 1 x Alcohol Lamp(without liquid) 1 x Tube 1 x Hemp Rope 1 x Alcohol Cap