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The technology was developed by Robert Mayflower, based on captured Chinese Hei Gui stealth suits, belonging to the Black Ghost counterinsurgency/terror units. Though the Stealth Boy is more portable and capable of projecting a more powerful stealth field, it has severe drawbacks.
Circa 2281, Doctor Henry acquired schematics for the Stealth Boy Mark II prototype. Experimental even before the Great War, he has managed to recreate one hoping to provide insight into the Nightkin's problems in Jacobstown.
This is the RobCo "Stealth Boy" Model 3001 Personal Stealth Device. Developed by Robert Mayflower, the Stealth Boy generates a modulating field that transmits the reflected light from one side of an object to the other making the bearer almost invisible to the untrained eye.
 Side effects
Repeated usage has been found to have unpleasant mental side-effects. It causes the user to suffer paranoia, delusions, hallucinations, and eventual schizophrenia. Obvious signs of stage one, paranoia include; fearing one's loved ones. This occurs after two to three uses. Stage two; delusions. This also, is one of the easiest stages to identify; sudden symptoms of being bi-polar also come into play. This happens after four to six uses. Stage three; schizophrenia. At this point, you would be completely insane, with little chance of ever going back. Stealth Boys has a pronounced increased risk of schizophrenia in super mutants. This is especially dramatic in the case of the nightkin, who, as permanent Stealth Boy users, nearly always show one or several symptoms.
 Stealth Boy
The Stealth Boy is a personal stealth device worn on one's wrist. It generates a modulating field that transmits the reflected light from one side of an object to the other, making a person much harder to notice (but not completely invisible).
 Stealth Boy mark II prototype
The Stealth Boy Mark II prototype is an enhanced Stealth Boy, put through testing by the Enclave during the Great War. According to Doctor Henry, its purpose was to use less power and therefore last longer.
 Behind the scenes
Although it is mentioned in Fallout 2 and its description is present in Fallout Tactics files. The device's back story wasn't developed until Van Buren, the canceled Fallout 3 by Black Isle, where it was spelled as StealthBoy to prevent it from being confused with the "Stealth Boy" playing style.