1. Electronic Mouse And Rat Repeller is effective in controlling mice, rats, roaches, fleas, flies, crickets, silverfish, waterbugs, moths, ants, and most other common pests. 2. Laboratory research has shown ultrasonic sound waves attack the auditory and nervous systems of most common pests causing them pain and discomfort. 3. 2 * 130 decibels of sound pressure. pest will give up their source of food, water, and shelter and move on. These high-intensity sound waves are out of the range of hearing of humans and most household pets such as dogs, and cats. fish and birds, and farm animals. 4. After plugging it in, you will notice a small red LED light, which indicates the device is operating properly,. 5. Having an "S” unique test button on the back panel, when depressed, causes the unit to shift its output down into the audible range of humans for a reassuring check of its ultrasonic output. 6. Not interfere with televisions, radios, electronic burglar alarms, fire or smoke detectors, pacemakers, hearing aids or other electronic equipment. 7. Suitable in: homes and apartments, food service, Businesses, Farms, and so on. It effectively protects an area measuring 200 square meters.