This is the Roomba that is specially designed to remove pet hair and dirt from carpets and floors. The unit's dual, counter-rotating agitator brushes spread carpet fibers and enable the powerful vacuum to remove deeply imbedded pet hair and other stubborn detritus from low and high-pile carpets. A built-in sensor detects which areas of the floor are most soiled and directs Roomba to spend more time cleaning that area. Another sensor redirects the unit when it encounters stairs and it has an enhanced anti-tangle technology that enables the robot to reverse the rotation of its brushes when it senses rug fringe. The robotic vacuum can be scheduled to navigate autonomously up to seven times per week, it cleans up to 1,200' sq. per charge, and automatically returns to its drive-on charger when its battery runs low. The included virtual wall projects an infrared beam to confine the vacuum to one room and a virtual buffer can be set next to a pet's water or food bowls to prevent Roomba from bumping them. Includes two filters, two sets of brushes, and a brush cleaning tool. Virtual wall and buffer require two C batteries. 5" H x 13 1/2" Diam. (8 2/3 lbs.)