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Aibecy Mini Hot Air Stirling Engine Motor Model Heat Power Electricity Generator Machine with LED Light Educational Toy Physics Experiment If you want to see more, please click #yoyo2018 This is an external combustion engine, to burn the fuel continuously, the expanding air  will work as a media to run the piston, then the expanding air will be cooled in cold chamber; It will be repeatedly circulating this process. Features: A Stirling engine is a heat engine that operates by cyclic compression and expansion of air or other gas (the working fluid) at different temperatures, such that there is a net conversion of heat energy to mechanical work. It is also an electricity generator, the power can light up mini LED light. The teaching and learning process will be more intuitive and more interesting. Well assembled, you just need to install the LED light and prepare the alcohol. The biggest advantage of external combustion engine is that its' output and efficiency won't be affected by altitude, even at high altitude it works well. Made of exquisite aluminum alloy and glass. Specifications: Material: Aluminum Alloy & Glass Speed: Up to 1200rpm Item Size: 15.5 * 8 * 8.8cm / 6.1 * 3.1 * 3.5" Item Weight: 470g / 16.6oz Package Size: 19.3 * 11 * 13.7cm / 7.6 * 4.3 * 5.4" Package Weight: 616g / 21.7oz Package List: 1 * Stirling Engine Model Kit 1 * Spare Conveyor Belt 1 * Spare Tube 1 * User Manual(English) Note: 1. Glass should not be exposed to water after being heated, or otherwise it will split. 2. If the alcohol is spill, please use wet cloth to put out the fire. 3. Children under 12-year-old should be accompanied by adult when using this product.