Features: brand new and high quality All you have to do is to take it out of the box and fill the lamp with 95% alcohol to heat the glass cylinder; then, after warming up for seconds, give the flywheel a spin and it will rotate rapidly and smoothly. It will light up the color-changing LED bulb mounted on the little generator. It's a vivid model displaying basic principle of external combustion engines. People bought it for kids' science project, physics/mechanics learning, etc., enlightening them to explore more scientific knowledge. It will definitely be a fantastic gift for those you love and SELDOM will our machine fail to cheer them up! The stirling engine equipped with a multicolor LED, you install it on the motor by yourself. 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. It's really interesting and imaginative toy. The bottom plate is made of brushed aluminum alloy, exquisite and beautiful; The frame is finished with CNC, which shows that the sandblasting treatment is firm; Flywheel with aluminum alloy;Heating cylinder for the custom-made thick glass material, long-term heating without pressure. overall model shape refined, combination of texture and beauty; 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 60-100 seconds, then give the wheel a gently push, it will run like a charm. Specifications: Material:Aluminum Alloy+Zinc Alloy+Heat-resistant Glass Dimensions: 16.5x9x98cm/6.49"x3.54"x3.85" Flywheel Diameter: 60mm/2.36" Drive Wheel Diameter: 25mm/0.98" Cylinder bore: 16mm/0.62" Voltage: 3-5V Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package includes: 1 x Stirling Engine 1 x Alcohol for Burner(Alcohol is not included) 1 x Spare Heating Glass Tube 1 x LED Light