iRobot 72-560LH Roomba 500-Series Lighthouse Virtual Wall The Virtual Wall Lighthouse uses an invisible infrared signal to help iRobot Roomba achieve the most efficient and thorough room-to-room cleaning. Contains Roomba in one room until the room is completely vacuumed then directs Roomba to clean the next room Also blocks off-limit areas in your home For use with Roomba 500 Series models 535 and up.