Deactivated bomb collar

The Deactivated bomb collar is a miscellaneous item in the Fallout: New Vegas add-on Old World Blues.

Characteristics
Bomb collars that were (presumably) deactivated and left behind by Elijah when he took his trip to The Big Empty. He then took a few bomb collars back with him to the Abandoned Brotherhood of Steel bunker and forced people to do his bidding in the Sierra Madre.

Location
They are located in the Little Yangtze Watch Tower. Once you enter the Little Yangtze Watch Tower, there are some located on the desk directly front of you. There are also some on the counter behind the desk and some on the shelf as well.