Features: 1.This All Metal Stirling Double Engine, because of the heat from high-grade alcohol, the engine will run madly and create the electricity. The power will go through the wire and drive the multicolor LED lighting. 2.Made of high quality metal material, long-term heating without pressure; it can run quietly and stably at speed. All the parts have done surface treatment to avoid rusting. 3.Fill the alcohol for burner with your 95% alcohol (we recommend this fuel) and light it. Let the light burn the round ended cylinder for about 60-120 seconds, then give the wheel a gently push, it will run like a charm. 4.No use, kerosene, gasoline, oil, wine, candles. Use 95% alcohol.This engine does not need to add water, oil, dry-burning air expands to generate power. 5.It has a wide range of application as, great gift for Kids' science project, Physical/mechanical learning, teacher’s Demo props on the class, birthday gift for friends, families, parents, kids, etc. Many of our customers come from school, colleague, etc. Specifications: Material: Metal Color: Gold Note: 95% alcohol, no water, no oil. Size: Approx. 17cm/6.69in Weight: Approx. 700g Package Includes: 1 Set Stirling Double Engine Kit note: 1.Alcohol lamp can not for touch the heating cylinder (broken glass tube) 2.Remove the alcohol lamp when adjusting the machine (anti-scalding) 3.Oil at three moving points of copper for head and crankshaft (faster rotation) 4.Connecting rod and crankshaft should not be too stuck (not rotated) 5.Do not add water (broken glass tube) 6.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 7.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!