The Pest-A-Cator featuring 2 technologies. Ultrasonic technology which sends a pulsating signal that helps control rodents and roaches, and patented electromagnetic technology, which sends a pulsating signal throughout the wiring of the home and other structures. Direct plug-in feature is easy to use. Plugs into any 110-volt outlet. Safe around children and household pets (except hamsters, gerbils, and other rodent pets). Covers approximately 2000 square feet.