Amazon.com - 2 Pack Dual Model Virtual Wall Barrier Compatible with iRobot Roomba i, e, s, 900, 800 Series Robots, Replace Part Number: 4636429 -
How do I use Dual Mode Virtual Wall® Barrier?
Amazon.com - 2 Pack Dual Model Virtual Wall Barrier Compatible with iRobot Roomba i, e, s, 900, 800 Series Robots, Replace Part Number: 4636429 -
Amazon.com: Rechargeable Dual Model Virtual Wall Barrier Compatible for iRobot Roomba 800 900 I/S/E Series e5 e6 i4 i6 i7 i8 and All Plus Versions S9 : Home & Kitchen
How to set up the Dual Mode Virtual Wall® | Roomba® 800 | iRobot® - YouTube