What are the specifications of a flamethrower?

In terms of structure, there are two types of handheld flamethrowers: one is the gas box integrated handheld flamethrower, and the other is the gas box separated flamethrower head.

1) Gas box integrated handheld spray gun: easy to carry, generally smaller in size and lighter in weight than separate models.

2) Gas box separated handheld flamethrower head: requires a card type gas cylinder, which has a large weight and volume, but a large storage capacity and longer continuous use time