Direct plug-in . LED status indicators . Built-in night light . Audible test button . Twin dual ceramic piezo sirens Exclusive Pest Control technology . Ultrasonic sound high/low band range selector . Continuous/Random on-off selector . Coverage: 2500 sq. ft., required one per floor The PestContro Deluxe is our most powerful indoor unit to repel rodent pests from your home or office. Just plug PestContro Deluxe into a centrally located area unobstructed by furniture and other objects. The PestContro Deluxe incorporates dual speakers that create a harsh ultrasonic siren, inaudible to humans.