Stealth Boy

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

Effects
Stealth Boy 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). The effects of the stealth field only last for about an hour, at which the Stealth Boy will run out of power and require recharging if possible.

Side effects
Repeated usage has been found to have unpleasant mental side-effects. It causes the user to suffer paranoia, delusions, and eventual schizophrenia. Because of this, most remaining Nightkin are now insane.

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.

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
Stealth Boy abuse is caused by using one too many Stealth Boys, and can allow you be able to turn invisible anytime you want. The Nightkin in New Vegas suffer from this.

Appearances
Stealth Boy can be found in the first Fallout and Fallout 3, 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.

Стелс-бой Skrado Boy