Stealth Boy (Fallout 3)

The RobCo Stealth Boy 3001 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).

Locations
Stealth Boys can be found everywhere in The Capital Wasteland and in shops like Moira's "Craterside Supply" and in various abandoned markets like Super Duper Mart. Stealth Boys can also be found in Ammo Crates, Metal Crates and rarely on fallen enemy bodies. There are also several in the museum of technology.

Caveat: The following locations should be verified independently. There are many Stealth Boys scattered about the wasteland. Until verification is done, no guarantees can be made as to the absolute veracity of all the following locations for all players.



Bugs
The use of the Stealth Boy while in combat with non-hostile NPCs and then crouching causes combat to stop. The NPCs revert to being friendly. The stealthboy completely ends any and all agression to the player from friendly NPCs on the spot, even if provoked. This can be exploited to allow you to kill anybody and then use a stealth boy to make the others non-hostile. In short, it lets you kill anybody in plain sight and then make everyone forget about it instantly, (instead of waiting 3 days outside of town.)

Apparently, the Stealth Boy can glitch and stop functioning, while still making you appear invisible to yourself. You will look invisible until killed.