Premium cleaning performance, Long battery life, Stylish redesign, Reasonable pricing, Compatible with all floor types.. 3-Stage Cleaning with AeroVac Roomba 620 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- Dirt Detect technology employs an acoustic sensor to identify dirtier areas and spends more time cleaning them.. iAdapt Responsive Cleaning Technology - iAdapt is iRobot's advanced system of software and sensors that allows Roomba to clean more of your room, more thoroughly. It ensures Roomba 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.