Hmmm...
Motion detector, 12 guage blanks fired from a pump shotgun...
just a thought...
more satisfying results than video & a meaningless phone call!
Just the unique sound of a shotgun shell being chambered hooked up to a motion sensor is enough. Years ago I thought this would make a wonderful burglar alarm that could be left on all the time but then I considered how the typical cop would react to it. Too dangerous.