Using its patented 3-stage cleaning system, Roomba 660 removes dirt, dust and much more. It has superior hair handling ability; the robot utilizes AeroVac Technology, maximizing air flow through its cleaning head to pull hair and debris off the brushes and into the bin evenly. The larger bin requires emptying less often and the innovative composition of the robot's longer-lasting brushes allows it to handle fibers such as hair more effectively, making maintenance quicker and easier than ever. The 660 automatically returns to its Home Base to dock and recharge between cycles. All you have to do is press "Clean." The 660 picks up an amazing amount of dirt, pet hair and other debris with its patented 3-stage cleaning system. A spinning side brush cleans along wall edges, counter-rotating brushes act like a dustpan and broom, and a powerful AeroVac vacuum pulls dirt, hair and debris off the brushes and into the large-chamber bin. Dirt Detect technology employs an acoustic sensor to identify dirtier areas and spends more time cleaning them. iAdapt Responsive Cleaning Technology is an advanced system of software and sensors that allows it to clean more of your room, more thoroughly. It ensures the 660 vacuums every section of your room multiple times, cleaning areas you can't easily reach including under furniture, around everyday obstacles, and along walls. It even avoids stairs and drop-offs, navigates past soft barriers such as couch skirts, recognizes cords and carpet fringe, and self adjusts to clean hardwood, carpet and linoleum. The included Virtual Wall keeps the 660 cleaning where you need it and blocks off-limit areas. The 660 can be scheduled to perform up to 7 sessions per week, even when you're not home. It comes with everything you need to maintain your robot: 1 Filter; 2 Side, 2 Bristle and 2 Beater Brushes; Self-Charging Home Base; 1 Virtual Wall (requires 2 C batteries - not included); 4 Extra AeroVac filters; 2 Brush Cleaning Tools.