Premium Ultrasonic Bark Control

Stops your dog's constant barking almost like magic. Barking activates the unit to emit a two-second ultrasonic sound that can only be heard by your dog. Startled, your dog will soon associate this unpleasant sound with his behavior and stop the unwanted barking. Unobtrusive table-top unit for indoor use. No collar needed. Creates a bark-free zone for one or more dogs. Device emits loud ultrasonic tone that only dogs can hear. Activated by dog's bark or manually by the owner. Operates on 9-volt battery which will last six months or 2,000 activations. Low battery light flashes to indicate low battery.