Stirling Engine Model Scientific Physical Model Gold Two Cylinder Stirling Engine Model Educational Toy Feature: 1. Physical experimental model: The glass tube and glass alcohol lamp make it easy to directly observe the movement of the piston. 2. Multifunctional: elegant packaging for prezent, low noise, low pollution, low operating costs. 3. Anti-slip: There are 4 anti-slip pads on the bottom of the machine model, ensuring stable operation. 4. Easy to use and durable: Fill the alcohol lamp with 95% alcohol (we recommend this fuel) and light it. Allow the light to burn on the cylinder at the round end for about 60-120 seconds, then lightly press the circle and it will act as a spell. 5. Versatile: ma a wide range of uses such as gifts for children's science projects, physical machine learning, demonstration props for classroom teachers, friends, family, parents, children's birthday gifts, etc. Specification: Item Type: Stirling Engine Model Material: Zinc alloy, stainless steel, glass, log Color: mirrored, gold Product size: about 17 x 13 x 9,5 cm / 6,7 x 5,1 x 3,7 inches (in manual measurement there is an error of about 1 cm) Output voltage: 3,05,5V Fuel: 95% alcohol Package List: 1 x Engine 2 x Alcohol Cover 2 x rope 1 x User Manual in English 1 x alcohol dropper (3 ml) 2 x Spare Heated Glass Tubes 2 x Lamp Beads 1 x LED filament string