Features 1、How Simulation Works: A stirling engine is a heat engine that converts the net thermal energy into mechanical work by circulating compressed and expanded air or other gas (working fluid) to operate at different temperature levels. 2、Desktop Tech Toy: This is a fun and imaginative desktop tech toy designed with dual mini generator loads to be more powerful. 3、Teaching Props: This stirling engine model ornament is a very useful teaching prop, which can realistically simulate the working process of the engine, which is convenient for learning. 4、DIY Model Ornaments: This model can be DIY by yourself to exercise hands on ability. After completion, it is also a great desktop ornament with a sense of technology. 5、Widely Applicable: It has a wide range of applications and can be used as a great gift for children's science projects, physics, mechanical learning, classroom teaching demonstration props, birthday gifts for friends, family, parents, children, etc. Specifications Item Type: Stirling Engine Model Material: Aluminum Alloy, Stainless Steel, Brass and Plastic Gross Weight: 548g / 19.3oz Product Size: Approx.180 x 90 x 85mm / 7.1 x 3.5 x 3.3in Gas Used: Butane gas Application: for children's science projects, physics, machine learning, classroom presentations, etc Package List 1 x Engine Model 1 x Alcohol Bottle 1 x Alcohol Lamp 1 x Lamp Wick 3 x Hex Wrench 1 x Sealing Ring 1 x Needle Roller 1 x Silicone Tube 1 x Magnet 1 x Instruction Manual