Check the listing for details. iRobot Roomba Authentic Dual Mode Virtual Wall Barriers Compatible With Roomba. Color: Black, Condition: New. Listed at 19.95 USD. iRobot Roomba Authentic Dual Mode Virtual Wall Barriers Compatible With Roomba This Dual Mode Virtual Wall Barrier Compatible with iRobot Roomba 500 / 600 / 700 / 800 / 900 / e / i and S Series Does not work with the J Series Virtual wall mode helps keeps your Roomba from crossing the virtual barrier that this device creates. Used to help "wall" off areas you want your Roomba to stay out of. Easy set-up with training no longer needed. When in Virtual Wall Mode the barrier blocks openings of up to 10 feet that stops the Roomba from crossing that line. When in Beacon Mode the barrier creates a 4-foot diameter that stops the Roomba from entering that zone...prefect to stop Roomba from bumping a pets water bowl. Batteries Not Included