This is the Roomba that allows you to schedule up to seven cleaning times or send the robotic vacuum on an impromptu spot-cleaning of a soiled carpet or floor using a wireless command center--a feature unique to the Hammacher Schlemmer model. The unit navigates through a room autonomously while its efficient brushes rotate at 1,650 rpm, sweeping debris toward its built-in vacuum. A sensor redirects the unit before it encounters furniture or walls, 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 Wall lighthouses project infrared beams that confine the vacuum to one room and, when the unit finishes cleaning the floor, the lighthouses allow it to move on to another room. The device has six side brushes that are angled toward the floor, ensuring more effective dirt removal along walls, and it has an air filter that removes dust and allergens. The large, bagless dustbin removes at the touch of a button. The robotic vacuum can clean up to four rooms per charge and automatically returns to its drive-on charger when its battery runs low. Most effective on hard floors and medium-pile carpets. Includes filter. Wireless command center requires four AA batteries. Virtual Wall lighthouses require two C batteries. 4 1/4" H x 13 1/2" Diam. (7 1/2lbs.)