Manufacturer: iRobot Product Name: Roomba / Dual Virtual Wall Switch between Virtual Wall mode and Halo mode, which allows you to set a circular keep-out area. Batteries are not included. Creates an invisible infrared wall to restrict Roomba or Braava from entering areas like a step-free entryway. Also, the "Halo mode" creates a circular keep-out area, allowing you to avoid areas like pet water bowls or places where cords are gathered. There are no noticeable scratches or stains, but please understand that this is a used item.