PetSafe Outdoor Ultrasonic Bark Control Birdhouse PetSafe Outdoor Ultrasonic Bark Control Birdhouse Outdoor Ultrasonic Bark Control Birdhouse. Length: 4 1/2", Width: 3 5/8", Height: 7". For outdoor use only. Weatherproof. Range up to 50 feet. Features low-battery indicator. For dogs of any size.