Amazon.com - PELLYDA Dual Mode Virtual Wall Barrier Compatible for irobot Roomba 800,900,I S & E Series,e5 e6 i4 i6 i7 i8 S9,5150,7550, e5120, e5152 and All Plus Versions,Light House for Roomba.(2
Amazon.com - 2-Pack Dual Model Virtual Wall Barrier Compatible with iRobot Roomba 500/600/700/800/900/e/i/s Series Robot Vacuum. Compare to Part 4636429
Amazon.com - iRobot Roomba Authentic Replacement Parts - Dual Mode Virtual Wall Barrier Compatible with Roomba 600 700 800 900 Series