There are 16 cylinders, 8 hot cylinders and 8 cold cylinders. Metal propeller on the front end for quick rotation during operation. As an external combustion engine, it avoids the explosion of traditional internal combustion engines to achieve high efficiency, low noise, low pollution and low operating costs. Solid wood base, can be operated for a long time without damage. Applicable People: 16 years old or older. First press the button to the fuel tank, then dial the above valve, ignite, wait for about 30 seconds to heat, turn the propeller to start, the position of the fuel tank has a knob to adjust the size of the firepower, for the life of the model, it is generally not recommended to adjust . After the operation, close the valve and the fire will be extinguished.