Feature: 1. Physical Model: Stirling engine motor model adopts glass tube and glass alcohol lamp to facilitate direct observation of piston movement 2. Anti Skid: Stirling engine motor model has four anti skid pads at the bottom, which can effectively ensure stable operation 3. Simple Operation: Stirling engine model kit is used for a long time. Add 95% alcohol (recommended) into the alcohol inflamer and light it. Let the lamp burn on the cylinder at one end of the circle for about 60 to 120 seconds, then gently push the wheel 4. Practical and Reliable: Stirling engine model has beautiful appearance, low noise and low pollution, and can be used with confidence 5. Scope of Application: Stirling engine toy kit is suitable for children's science project gifts, physical machine learning, classroom demonstration props for teachers, etc Specification: Item Type: Stirling Engine Motor Model Material: Zinc Alloy, Stainless Steel, Glass Output Voltage: 3.0 to 5.0V Fuel: 95% Alcohol Color: Golden. Package List: 1 x Engine Model1 x Alcohol Bottle1 x Spare Heating Glass Tube1 x Alcohol Pad1 x LED Lamp Bead3 x Gum Ring1 x Bulb1 x Rubber Ring