I’ve seen these sonic pest control things in stores and I’m just wondering if they work. You plug them in and they supposedly make a high pitched noise that humans and dogs can not hear, but mice and rats can and it keeps them away. I live in an old apartment complex and I can hear scurrying in the walls occasionally. I would really like to keep the “scurrying” out of my apartment. Before I waste my money, I’d love a second opinion!