Stirling Engine: Unlike ordinary Stirling engines, it features balanced structure. It is equipped with a small generator, and heated by alcohol, the engine runs steadily at high speed and generates electricity, which can provide a bright voltage digital display meter This is a fun and imaginative desktop technology toy that is even more attractive if you try to run the engine in the dark. Watch the magic work and energy transformation process Fine Workmanship: Made of metal. The surface is finely polished to prevent rust and fading. Thickened quartz glass tube can be heated for a long time. The piston can run for a long time, and it is not easy to wear Usage: It is not only a science educational toy that can be used to study the working principle of the external combustion engine, providing material for children's science projects, to inspire their curiosity and creativity, but also a cool desktop artwork Power generation voltage up to 5V Colour:silver Gold Material:Metal Size:165 x 95 x 130mm Package Contents: 1 * Stirling Engine 1 * Alcohol Lamp 1 * LED 1 * Bulb Only the above package content, other products are not included.