As Seen on TV! Pest Repeller Pest Control Against Mouse, Rat and Insects with Built in Night Light Plugs in using safe & effective ultrasonic technology, drive rodents away without poison Critters can't stand the digital pulses.so they leave Pet and kids friendly; No chemical products; No maintenance necessary ; Just plug in Use one unit per floor, has comforting built in night light NOTE: it can take up to a month to clear the house completely if nests are with young