iRobot Roomba Standard "slim-line" virtual wall Twin-Pack
Virtual Wall prevents Roomba from entering off-limit areas in your home. Each emits an adjustable infrared beam (up to 13 feet) that Roomba will not cross. Each Virtual Wall requires 2 D batteries (not included). Compatible with 400 Series, Discovery Series 4100 4200 1100 and Original Roomba models. twin-pack.