Transparent Steam Engine: The vertical structure of the steam engine, the cylinder and the valve mechanism are easy to observe, the transparent cylinder design, the piston movement can be clearly seen. The large-size flywheel design enables faster start-up and smoother operation. Simulated air jet sound. Spherical boiler, the steam pressure is evenly released. The boiler is equipped with a mini valve, a splash-proof exhaust tube, an all-brass alcohol lamp, and a fire-extinguishing gland to ensure use. Excellent Manufacturing Process: The boiler is made of all metal materials, which is strong, and has a short start-up time. Instructions for Use: Place the model on the desktop, unscrew the boiler valve and add water, light the alcohol lamp, heat the boiler, heat the boiler water to boiling point, turn the steam engine flywheel by hand to help start, and the machine can run. Note: The water in the boiler can only be added up to 2/3 of the capacity. The machine is forbidden to dry without water. Children should use it under the supervision of an adult.It can be used as a scientific educational toy for studying the working principle of external combustion engines, providing materials for children's scientific projects, inspiring curiosity and creativity, or as a cool desktop decoration artwork. size: 200 x 90 x 140mm Material:Metal colour:As shown Package Contents: 1 x Steam Engine Model