A combination of electromagnetic and ultrasonic action - inaudible to the human ear and household pets - helps drive away unwanted rodents with no harmful chemicals involved. Plugs into a wall socket and emanates pulses which reach nest sites within wall cavities and ceilings. Plug-in pest control for the homeEffective against rodentsCombines swept ultra-sound and electromagnetic actionIn-audible to humans, cats and dogs and safe for use around childrenTest button and halo-red LED indicator