iRobot Dual-Mode Virtual Wall Barrier for Select Roomba Vacuums 4636429 - Best Buy
Amazon.com - ilovelife 2 Pack Dual Model Virtual Wall Barrier Light House Compatible with iRobot Roomba i, e, s, 900, 800 Series Robots, Replace Part Number: 4636429
How to Set Up the Dual Mode Virtual Wall in Halo Mode | Roomba® 980 | iRobot® - YouTube
Amazon.com - ilovelife 2 Pack Dual Model Virtual Wall Barrier Light House Compatible with iRobot Roomba i, e, s, 900, 800 Series Robots, Replace Part Number: 4636429