iRobot Roomba Virtual Wall Scheduler. A Virtual Wall emits an adjustable infrared beam (up to 13 feet) that prevents your home robot from entering off-limit areas in your home. Scheduling capability allows you to preset cleaning times so the robot cleans routinely, when it's most convenient for you. Requires 2 D batteries (not included). Requires iRobot Scheduler Remote (Item 5100) to activate scheduling capability. For iRobot Dirt Dog, iRobot Roomba Discovery, Discovery SE and 400 Series vacuums.