Broken detonator

 is a miscellaneous item in Fallout: New Vegas add-on Old World Blues.

Characteristics
It has the same appearance of a normal detonator, this one is broken and therefore cannot be equipped and is simple a miscellaneous item used to show where the collars originated from.

Location
It is located in the Little Yangtze Watch Tower. Once you enter the Little Yangtze Watch Tower, it's on the desk front of you.