Use your brain.
If they had placed explosives elsewhere they didn't need some electronic sign in full view to detonate it.
Explosives big - electronic detonator small.
If they managed to hide the explosives they would have hidden the detonator with it. It kind of defeats the purpose to hide the bomb and put the detonator in plain view...
Paranoia will destroy ya.
instilling terror means never being certain of what is going to go off where. you are thinking logically and the objective of terror is to keep you off balance. i think it is perilous to dismiss this kind of thing, obviously you have a different opinion, but what i really want to slap you senseless for is the dang EARWORM! ; )
These things were in 10 cities for the past three weeks...yet Boston is the only city to freak out over them.