The Roomba 440 Cordless Robot vacuums so you don't have to. Just press the clean button and Roomba does the rest. Its powerful vacuum and counter-rotating brushes reach deep into your carpet to remove dirt, dust and pet hair. Virtual walls tell it where to clean by restricting off-limit areas, and it automatically senses and avoids stairs and drop offs, so it cleans the whole floor, under and around furniture and along walls. Unit automatically adjusts to vacuum carpets and hard floors, and senses dirtier areas that need more thorough cleaning. Spot mode quickly cleans up spills and concentrated messes.