PetSafe Indoor Bark Controller

PetSafe's Indoor Bark Control speaker deters your dog from barking inside without using electric collars. Place the speaker in an area where your dog barks the most. Loud noise triggers a high-pitched sound inaudible to humans, but is unpleasant to canines, causing your dog to associate unpleasant sound with their barking. Microphone prevents false triggers, so it only goes off when your dog barks. Performs best in single-dog homes. Free-standing or mountable with included adhesives. Water-resistant construction. Low-battery indication. Powered by two 3-volt CR-2032 batteries (not included). Per 2. 2.75"H x 1.75"W x 1.25"D.