Using the latest ultrasonic technology, the Ultrasonic Dog Chaser produces a discomforting, but not harmful, high frequency sound, audible to dogs but not to humans. Help stop the approach of unwanted dogs up to 15 feet. Simply press the power button and aim the unit at the approaching dog. The ultrasonic waves emitted by Dog Caser will discomfort and deter the approaching dog. Can also be used for training purposes. Requires one 9V alkaline battery. Unit measures 3-5/8" tall, 2-3/8" wide, 7/8" thick. Weighs 4oz. with battery installed.