The Pulsefire is the ultimate compact, lightweight, fully handheld flamethrower that sends a blast of fire 25 feet away with the press of a button. Not legal in MD. Not CA compliant.
Flamethrower ownership is generally legal in the United States without requiring any sort of background check.
As the product name states, it is simply a long range torch. However, Maryland and California do have restrictions regarding such devices. The city of Warren, Michigan also prohibits possession via local ordinance.