markgoodson, can I just plug in the props AC plug or the "try me" button into that mat then maybe the mat has a power plug that goes into the wall so when you trigger it, it sets off the animated prop?
You just have to cut the wires by the alarm box and the wires for the "TRY ME" button on the prop. Splice the wires from the mat to the ones formerly for the "TRY ME" and you are good to go. The mat will now act as a trigger for the prop, instead of the try me button. Plus the Harbor Freight mats have a long wire (30+ feet).
I've done it once before with one of those cheesy "Happy Halloween" door mats that screams and makes noise. It worked well on an older "head ripping zombie" from Spencers. The mat is nothing more than a big momentary contact switch with low voltage DC power, so the Harbor Freight alarm mats should work. I just ordered two for myself, so we'll see how well they work.