The Pest-A-Cator plus has 2 technologies. Ultrasonic and electromagnetic which sends a pulsating signal that helps control rodents and roaches. Also the electromagnetic technology, the patented activity sends a pulsating signal throughout the wiring of the home and other structures. Direct plug-in feature is easy-to-use. Just plug into any 110V outlet. Safe around children and household pets (except hamsters, gerbils, and other rodent pets). Covers approximately 2000 sq ft. Just plugs into home outletPatented Pulse TechnologyWorks with electrical wiring in your homeSafe House Pets