It is a small device that you flip on, and it sends an ultrasonic wave out. This is inaudible to the human ear, but the dog can hear it. This is not painful to the dog; it just causes them to take notice, and causes them to stop barking.
This product has many applications. It works great on your dog, but the signal can also be used on other dogs such as your neighbor's if their dog is a problem for you.
Once you try it, you'll wonder how you could have lived without it. If you would like to know more, click on the ad below.
