I am simply amazed with how great this collar works! Within 24 hours, I was hearing no barking. Within a week my dog was no longer obsessed with what was going on outside. He used to get so worked up if someone was walking their dog on the sidewalk across the street. Running from window to window whining, barking, panting. Now I can leave the screen door open. He stands at the door, tail wagging, and watches them pass by. If he feels a genuine threat, he gives three quick barks. The collar sounds off, and he’s proud that he was able to notify me of possible shenanigans. We could not be happier!