How the Outdoor Bark Control WorksWhen the Outdoor Bark Control is within range of a barking dog, an internal microphone picks up the sound and the unit is automatically activated. The Outdoor Bark Control emits an ultrasonic sound. The ultrasonic sound can be heard by dogs but is silent to humans. Startled by the high-pitched sound that is safe and effective, the dog should stop barking, as it will associate its bark with this unpleasant noise. Features:Uses ultrasonic sound to deter unwanted barkingDetects barks up to 50 feet with the use of an internal microphone4 levels of operation including a test mode Durable and weatherproof for outdoor usePossible Uses for the
