Well-made Stirling Engine Mode:The whole body is made of Zinc alloy and stainless steel, and oaken base with 4 anti-skid pads at the bottom of model machine, The fly wheel is made of metal and epoxy process, enhance the industrial texture. Attractive LED Light:The flywheels will rotate , making the generator's Lamp bulb lighting. When the , it will be very shocking and attracting eyeballs. Superior Performance:Dual cylinder engine is full of power and the voltage can reach 3.0-5.5V. Great Educational Toy:The glass tube and glass alcohol lamp easy to watch piston movement directly. The best gift for students, teachers, children, friends and colleagues. 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 , then give the wheel a gentle push. Model:Stirling Engine Kit Hot Air Motor Model Output Voltage:3.0-5.0V Fuel:95% Alcohol Notes: 1.Kids should be accompanied by adult. 2.Recommend using alcohol with purity95%(prepared by buyer self) 3.HOT! HOT! HOT! 't touch the glass when using. 4.Be careful of the alcohol spitting out, it very dangerous, If spitted out, 't be panic, use a wet to cover the fire. 5.Both ends of the connecting rod joint activities need to add regular oil lubrication, the piston can not refuel, otherwise it will not work the resistance. Colour:Gold & wood color Material:Zinc alloy + glass + stainless steel Package Contents: 1 x Engine Model 2 x Alcohol Lamp (no alcohol) 1 x Alcohol Dropper(3ml) 2 x Spare Heating Glass Tube 2 x LED Bead 1 x LED Light String 1 x English instruction manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.