I have two vibrating . . . pegs, I guess you'd call them. Battery operated. I had a gopher hole in a garden. I put that in and it left. I understand they don't like the vibration because they can't tell if predators are out there. If I were a gopher, however, the noise would drive me to distraction - who cares about any other reason. The hum is actually pretty quiet to our ears, hearing it through the air and not the ground. No bodies to dispose of. No mangling or torturing an animal. For me, it's great!