Feature: 1. Physical Experimental Model: Glass tube and glass alcohol lamp facilitate direct observation of piston movement. 2. Anti Skid: There are 4 anti skid pads at the bottom of the model machine to ensure steady operation. 3. Simple Operate: Long lasting, fill the alcohol burner with 95% alcohol (we recommend this fuel) and light it. Let the light burn on the cylinder at the round end for about 60120 seconds, then push the wheel lightly and it will work like a charm. 4. High Performance: Elegant and beautiful appearance, low noise, low pollution, low running cost. 5. Multipurpose: With a wide range of applications, such as gifts for children's science projects, physical machine learning, teacher demonstration props in the classroom, friends, family, parents, children's birthday gifts, etc. Specification: Item Type: Stirling Engine Model Kit Material: Zinc Alloy, Stainless Steel, Glass, Log Color: Grey Output Voltage: 3.0~5.0V Fuel: 95% Alcohol. Package List: 1 x Engine Model1 x Alcohol Bottle1 x Alcohol Cover1 x User Manual1 x Spare Heating Glass Tube1 x Lamp Beads1 x Alcohol Rope1 x LED Light String