iRobot Roomba 581 Vacuum Cleaning Robot features great innovations for improved performance, reliability and durability. On-board scheduling allows you to preset up to seven cleaning times per week for Roomba to clean when it"s most convenient for you - whether you"re at home or on the go. Roomba 581 systematically cleans four rooms on a single charge, gets into hard-to-reach areas like wall edges and beneath furniture, avoids stairs and other drop offs and automatically adjusts from carpets to hard floors and back again. Each Virtual Wall Lighthouse (3 included) confines Roomba to one room until the entire floor is vacuumed before Roomba moves on to the next room. Standard Features. Adjusts from carpets to hard floors and back again, Detects dirtier areas and spends more time cleaning them, Spot Clean provides quick clean-up of spills and concentrated messes, Senses and avoids stairs and other drop-offs, Returns to its self-charging Home Base to dock and recharge between cleanings, The side brush makes Roomba even more efficient at cleaning edges and corners. Won"t get tangled on cords and tassels.