I set up the ding dong last nite in a window, overlooking a piece of tin foil I smeared with peanut butter, hoping to lure our possum to the bait and take him out. No ding dong, no possum, he must have moved on during the winter, but I was pleasantly surprised a few minutes ago when the alarm went off, and there was a squirrel at the bait. That's pretty sensitive imo.. If it continues to work like this, I will be impressed!