The ideal way to control your neighbor's dog and its nonstop barking! Disguised as an ordinary birdhouse, this weatherproof PetSafe® Outdoor Bark Control Ultrasonic Unit detects barking up to 50' away and emits a safe, high-pitched sound (inaudible to humans) that encourages the pooch to cease and desist. Runs on a 9V battery (not included). Manufacturer model #: PBC00-11216. Uses ultrasonic sound to deter unwanted barking. Detects barks up to 50 feet with the use of an internal microphone. 4 levels of operation: 3 sensitivity levels and a test mode. Durable and weatherproof for outdoor use