This is Roomba, the robotic vacuum that courses autonomously through rooms and cleans floors and carpets using a powerful motor and proprietary brushes specially designed to remove deeply imbedded pet hair from carpets. The unit has dual, counter-rotating agitator brushes that spread carpet fibers and enable the vacuum to remove pet dander, kitty litter, and dust and dirt left behind by paws. The motor provides superior suction that captures pet dander from low- or high-pile carpets. A sensor redirects the unit before it encounters furniture, walls, or stairs, and it has an enhanced anti-tangle technology that enables the Roomba to reverse the rotation of its brushes when it senses rug fringe. Two Virtual Walls project infrared beams that confine the vacuum to one room, ensuring thoroughly cleaned floor surfaces. The robotic vacuum can clean up to three rooms per charge and automatically returns to its drive-on charger when its battery runs low. Includes a set of additional brushes and filters. Virtual Walls require two C batteries. 3" H x 13 1/2" Diam. (7 1/2 lbs.)