DOGTEK Sonic BirdHouse Bark Control Outdoor Indoor Battery Operated

DOGTEK sonic birdhouse bark control outdoor indoor battery operated. 7" high. 5.5" wide. 4" deep. 9 volt battery not included. This works if your dog is sensitive to and bothered by high pitched sounds. One possible way to know is if your dog is bothered by a chirping smoke detector or a washing machine that is out of balance and is beeping. Also, since this device will make the sonic noise when a dog barks it is not ideal if you have more than one dog. One dog will bark but they all will hear the noise. When I used this I would go out on the deck and turn it on and off once. It would make the sound and correct the right dog. (The only one that was bothered by the sound). It was quite effective for me.