After loosing my absolutely favorite girl to a dog attack (also a dozen attacks over the years, my girls open free range), I set up a perimeter beam alarm to know when anything large crosses onto my property (chickens walk under it). I mainly have issues with large dogs or coyotes. Inside the house a bell alerts me, it's also got lights to tell which beam is being tripped so I know where to look. What a dream, now I know when to grab my shotgun and head outside. Before I was on constant "dog watch", what a pain. Anyone else with a beam alarm?