Weitech 0585 500 Square Foot Plug In Pest Repeller with Night Light Repels mice and insects with ultrasonic sound waves Useful for controlling rodents, spiders, fleas, cockroaches, crickets Plugs directly into wall socket; covers up to 500 square feet Night light makes it useful for children's bedrooms Won't harm pets and children; 4-1/2 by 2-1/4 by 1 inches