| ||For an overview of collar models that appear in the Fallout series of games, see collar.|
These bomb collars were deactivated and left behind as Elijah took his trip through the Big MT. Elijah would later take a few bomb collars back with him to the abandoned Brotherhood of Steel bunker to force people to do his bidding in the Sierra Madre.
They are located in the Little Yangtze watchtower. Once you enter there, a few will be located on the desk directly front of you. There are also some on the counter behind the desk and on the shelf. There are eleven in all.