Using the latest ultrasonic technology, the dazer II produces a discomforting but not harmful high powered sound, audible to dogs but not to humans. Help stop the approach of unwanted dogs at up to 20 feet. Also a useful aid in training dogs. Made of lightweight high impact plastic, the dazer II features a belt clip and low battery indicator, includes a long life 9 volt energizer battery and is made in USA. The dazer II makes a great gift idea.