| ||For an overview of collar models, 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, directly inside the entrance.
- Several are also located on the counter behind the desk and on the shelf, 11 total.