Description: Product Name: Stirling Engine Model;  Size: 16.5x9x98cm/6.49”x3.54”x3.85”;  Flywheel Diameter: 60mm/2.36”;  Drive Wheel Diameter: 25mm/0.98”;  Cylinder inner diameter: 16mm/0.62”;  Color: Silver;  Material: Aluminum Alloy + Zinc Alloy + Pyrex Glass;  Voltage: 3-5V;    Usage: 1.Placed the Stirling engine in a horizontal position, use your hand to toggle the flywheel to see if it is smooth.  2.Check if every sliding parts is clean.  3.Fill the alcohol burner with no more than two-thirds.  4.Light the alcohol burner, toggle the flywheel after 2 minutes.  5.LED lights can be directly inserted into the generator output interface. If it does not light up, exchange the positive and negative port, the long one is positive.    Note: 1.After using it, please let the engine natural cool.  2.Do not touch the alcohol burner, burned tube or the metal to avoid burns.  3.When heating the alcohol burner, do not make the cotton line bump into the tube. If may cause the tube cracked.  4.Rods at both ends of the activities of joint parts need to regularly add oil lubrication, the piston can not refuel, otherwise it may cause big resistance and can not run.    Package Included: 1 x Stirling Engine;  1 x Alcohol Burner(Alcohol is not included);  1 x Spare Heating Glass Tube;  1 x LED Light