Motion activated digital coyote deterrent?

There are several digital predator gadgets out there that will simulate just about any sound you can imagine so that hunters can lure a choice prey into their view.

The problem is price. Most of the high end units can cost anywhere from 400 to 800 dollars! That's why I'm posting about the device above. It's only 20 dollars plus shipping and has a setting called "coyote serenade".

I know it would take some tinkering, but it seems possible to maybe hack one of those driveway alert systems to trigger the coyote sound when the motion sensor is activated.