Stealth Boy

The RobCo stealth boy 3001 is a personal stealth device worn on one's wrist.

History
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.

After the Great War, it was used by the Nightkin elite super mutant units of the Master's army.

In Fallout: New Vegas Doctor Henry is in possession of schematics for Stealth Boy Mk II. Experimental even before the great war, he has managed to recreate one hoping to provide insight into the Nightkin's problems. However upon asking Lily Bowen, a friendly nightkin to assist with the experiment he is soon interrupted by Keene who demands the Schematics so he and his band of nightkin can modify existing stealth boys to mark 2. The Courier then has a choice between talking Keene out of it, killing him or giving him the schematics.

Some time after they acquired the stealth boy technology, the Brotherhood of Steel experimented with those devices. When the side effects were discovered, the devices were banned and the team disbanded. However, it was not known that the team had already begun to suffer the effects of the device. Thinking the disbanding of their team to be a conspiracy, they decided to steal the stealth boys and form a new covert operation called the Circle of Steel.

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 ones 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. Nightkin in New Vegas suffer from this, especially Davison (and presumably Tabitha).

Appearances
Stealth boys can be found in the first Fallout, Fallout 3, and Fallout: New Vegas, 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. It was going to appear in the canceled Fallout: Brotherhood of Steel 2 as "stealth girl", as it was usable only by Scarlet, a female character. Stealth Girl later became a referance used in Fallout: New Vegas, as the companion perk given by Lily, a female nightkin, the perk provided a 200% increase in stealth boy duration.

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