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iRobot Roomba 690 Vacuum Cleaner with 2 Virtual Walls, Batteries, and Filters | eBay
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Replacement Battery for Roomba 500 600 700 Series APS Battery 555 595 620 630 650 660 790" - Walmart.com
Virtual Wall® - YouTube
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iRobot Roomba Virtual Wall – New Screwdriver
Roomba Virtual Wall Mod, for In-wall AC Power (no More Batteries!) : 8 Steps - Instructables