Ultrasonic Bark Control

The PetSafe® Ultrasonic Bark Control effectively deters barking when it is worn. When the microphone picks up the sound of your dog's bark, the unit emits an ultrasonic tone that can be heard by your dog, but is silent to most humans. Startled by the high-pitched tone, the dog should stop barking, as it will associate its bark with this unpleasant noise. Features For dogs 3.6 kg and up Fits neck sizes up to 71 cm Ultrasonic sound only your dog can hear Microphone detects bark Water resistant Uses 2 3-volt lithium batteries (included) Battery usually lasts 1-3 months Low battery indicator System Includes Bark Control unit Adjustable nylon collar 2 3-Volt Lithium CR2032 Batteries Operating Guide