Since I had several pieces of equipment stolen from the back of my truck, in my back yard, as I slept one night last year, I needed a cool way to catch them in the act the next time someone came to pay me a visit....The best thing I came up with was this gadget I bought at Home Depot..It has a motion sensor that I mounted overlooking my trucks and trailers...and another piece that plugs into the wall in our bedroom that chimes when motion is detected. You can plug a lamp into it and the lamp will come on when motion is detected, but I don't do that. I wanted to catch the person not scare them away...Well after a year of having this unit, and after many false alarms from cats, dogs, deer, and the wind, it paid off a few weeks ago. The chime went off at 4 am one morning, I jumped up to look out the window, and my heart almost came out of my chest....There was a man walking around my trucks....Everyting was locked down, and he didn't have anything in his hands...so I watched him for a few moments as he walked toward my neighbors house...I then grabbed my gun and threw some pants on and went out....I didn't see him, so I came back in and called the Police...Well, some 20 min. later I finally saw a police car coming by...The guy had enough time to be across town by then!!! That's another story... If you have a home based business and need a good suggestion for security this unit is well worth it....I can't wait until next time!!! Someone out there knows what I have and I'm sure they are licking their lips in anticipation of all the meth they can buy with the money from my equipment.