Nonsense, the best defense is a well trained scary butt dog. Even someone armed would think twice about approaching me. If you can't have or don't want a dog then it might not be a bad idea.
I hope it can't be set off accidentally by unintended pressure.
I was visiting hubby a couple of days ago and accidentally sat on the nurse call button.
Embarrassing but no big deal, but a false rape alarm? Not good.