Feature: 1. Anti Slip Design: Stirling scientific physical model has 4 anti slip pads at the bottom to ensure smoother operation. 2. Low Noise: Stirling engine motor model has beautiful appearance, low noise, little pollution and low operating cost. 3. Easy to Observe: Glass tube and glass alcohol lamp are convenient for direct observation of piston movement. 4. Multi Purpose: Stirling engine model kit has many purposes, can be used as a physical experiment model, and is also an interesting toy, can be given to children as holiday gifts, and they will like this gift. 5. Easy to Operate: For long use, add 95% alcohol (not included) to the alcohol bottle and ignite. Let the light burn on the cylinder for about 60 to 120 seconds, then gently push the wheel and it will work. Specification: Item Type:Stirling Engine Model Kit Material: Zinc Alloy, Stainless Steel, Glass Output Voltage: 3.0-5.0V Fuel: 95% Alcohol (Shipped Without Alcohol). Package List: 1 x Hot Dry Assembly1 x Cold Steel Assembly1 x Main Unit1 x Baseboard1 x Connector1 x Screwdriver7 x Screw1 x Hose1 x Alcohol Bottle1 x Alcohol Wool2 x LED Lamp1 x Hex Wrench1 x Foam Pad1 x User Manual Note: Shipped Without Alcohol