Virtual Wall Lighthouse uses an invisible infrared signal to guide Roomba through 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. Only compatible with Robot SKUs 53501, 54001, 55001, 56001, 56201, 56501, 57001, 57101, 78002 and R790020. Use the link below to determine which model you have.