Last year I helped a friend install a green laser at his business with a matrix of bounce mirrors to make a deterent for would be theives. We also implemented a photoelectric activated dialer that is hard wired into the phone line to call his cell if the beam was broken. Works good as I hear he tests it every week or so. He gets the visual aspect from the outside close to the front door and the not so easily seen beam from the rest of the facility.
You are the only one that can make your dreams come true....and the only one that can stop them...A.M. Dietrich