Train and repel dogs with the new Dog Master from Viatek Products. Using the latest ultrasonic and sonic technology, this dog repeller produces a discomforting but not harmful, high frequency sound, audible to dogs. Point the laser beam and the pull the trigger to blast up to 50 feet away helping stop the approach of unwanted dogs. Two settings: Dogs and Cats. A wonderful tool for training dogs from barking and unwanted behavior or great for repelling animals and cats.