iRobot 53501 Roomba 500 Series Vacuum Cleaning Robot with Self-Charging Home Base Vacuum-cleaning robot with self-charging home base 2 High-speed, counter-rotating brushes; anti-tangle technology; side brushes Gentle-touch bumper; dirt sensor; built-in cliff sensors; self-charging home base Includes bumper extension, cleaning tool, power adapter, rechargeable battery, 1 extra filter, 1 virtual wall, and batteries Measures approximately 13 by 13 by 4 inches