Features: How it works A Stirling engine is a heat engine that operates by cyclically compressing and expanding air or other gas (working fluid) at different temperatures so that net heat energy is converted into mechanical work. Intuitive explanation Teaching will be more intuitive and interesting. Easy to understand Students can understand this faster and better. Easy to install The assembly process is quick and easy. Technical data: Model: LL-002 Material: Galvanized Iron Sheet and Glass Speed: up to 200 rpm Display Built-in Engine Size: 16.2*8.8*8.3 cm/6.4*3.5*3.3" Engine Weight: 308g/10,8 oz Package Weight: 464g/16,4oz List of packages: 1 * set for self-assembly of stirling motor; 1 * alcohol lamp (without liquid) 2 * spare pipe 1 * User Manual (English/Chinese) Note: 1. Glass should not be exposed to water when heated, otherwise it will break. 2. If alcohol spills, use a wet cloth to put out the fire. 3. Children under 12 years of age should be accompanied by an adult when using the tego product.