I'm so glad I got a chance to try out this Outdoor Bark Control house for my dogs. It's small, light and runs off batteries. I hung it out on my back porch on the side where my dogs are. As soon as I turned it on and they started barking it worked. I've used it for about a week now and it has never been quieter here at my house. It even helps with the neighbors dogs cause I stopped hearing them too.