Cloaking (D20 Modern Equipment)
From D&D Wiki
When this is activated (a standard action), the creature or character that activated it becomes invisible, as per an invisibility spell for two rounds. A creature or character that succeeds at a DC 20 spot check can see through the cloaking, treating it as total concealment. Each cloaking device may only be used once.
Cloaking has a purchase DC of 45, with a restriction of Mil (+3), and weighs 5lbs.