4491744 Dual Virtual Wall This is an iRobot genuine accessory for Roomba and Braava. It is unused, included with the main unit, and is still shrink-wrapped. I am selling it because I don't plan to use it. [Manufacturer's Description] Product Number: 4491744 Creates an invisible infrared wall to restrict Roomba or Braava from entering areas like doorways without steps. Also, the "Halo Mode" creates a circular no-entry zone, allowing you to avoid areas like pet water bowls.