Take a wooded cloths pin (the wooded spring load kind) run 2 small screws through the opening ends- you now have your switch. Now get a 12 volt car battery and a car horn. wire them all in series, wraping the wires around the screws that stick through the cloths pin (your switch), just wedge the cloths pin under a tire or in a door crack or and obscure place that requires a movement and bam if it moves the cloths pin snaps together and horn sounds. I wedged it under my golf cart tire that sits in the trailer with the golf cart brake off if somebody tries to toe the trailer away the cart rolls to the back and the horn sounds Ive even wired it into my trailer brakes and now them fucken theves will be stoped in there tracks with their vehicle hooked to my trailer when I come out to greet them. hope this saves somebodys shit.