Features: ★ RTR Version Stirling model, no need to assemble, unbox the engine model and get ready to see the wonders of science. ★ Well-made Stirling Engine Mode: The whole body is made of high quality stainless steel connecting rod and aluminum alloy with finishing process. The base is made of high-grade imported oak, and there are sponge anti-slip pads at the 4 corners. Great to decorate your desk. ★ 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: The Stirling engine equipped with a LED. As the power will go through the wire and drive the LED light to lit. 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 for students, teachers, children, friends and colleagues. Specification: Item Name: CNC housing high speed Stirling Generator Motor engine model Color: Gold Material: Stainless+Aluminum alloy+ Weight: 500g Size Of Engine: 170x80x105mm(L*W*H) Output Voltage: 3.0~5.0V Fuel: 95% alcohol Package Size: 17.5 x 9.5 x 11.5cm/6.8 x 3.7 x 4.5in Package Weight: 510g/1.1lb Packing list: 1 x Engine mode 1 x Alcohol Lamp (without liquid) 1 x English Instruction Manual( contained operation video) 1 x Alcohol Dropper(3ml) 1 x Spare Heating Tube 2 x Led Bead 3 x Hex Wrench 1 x Tweezer