Stealth Boy Mark II Prototype

The  is a consumable item in Fallout: New Vegas.

Characteristics
The Fallout: New Vegas Stealth Boy Mk II is an enhanced Stealth Boy, put through testing by the Enclave during the Great War. It enables the user to go indefinitely invisible, does not factor in running, Pip-Boy light, or any other normal things that can render a Stealth Boy useless; in effect, you are invisible, for as long as you want, and nothing factors in to stealth. This Stealth Boy can be 'toggled'for use. There is only one Stealth Boy Mk II. -Fallout Gehrlein

(No visible difference in object)

The Stealth Boy MkII is added to a Dresser in Doc Mitchell's house so you can grab it at the start of the game.

Bonuses Stealth Field effect StealthField Stop Combat effect +50 to sneak