Roomba Discovery is leading the way into the next generation of Roombas. With more advancements and improvements, Roomba Discovery features dirt detect, a self-charging HomeBase(TM) and an Advanced Power System that make this the finest robotic floor vac on the planet. And there's still a lot of planet left to cleanRoomba Discovery Features:Air FilterPrevents dust and dirt from enteringRoomba.s vacuum system or your airAdvanced Power SystemMicroprocessor-controlled charging system that provides up to 120 minutes of cleaning power3-Hour ChargerCharge Roomba's batteries in only THREE hoursActive Dirt ResponseDetects dirtier areas and automatically increases the intensity of Roomba.s cleaningDockingRoomba now has the built-in intelligence to return to its own charging Home BaseStasis SensorRoomba immediately detects when it's stuck and initiates its careful escape routineCleaning IntelligenceRoomba automatically calculates how long it needs to work to clean your entire roomRemoteThe Roomba Remotemakes operating your Roomba even easierMax ModeRun your Roomba for the full charge of the battery to vacuum multiple roomsWall Mountyour Roomba out of the way in this convenient storage unitSpot ModeIntensely cleans one area of a room up to three feet in diameterVirtual WallKeep your Roomba where you want it by blocking doorways with this invisible beamProprietary Cleaning SystemHigh efficiency vacuum andcounter-rotating brushes to reach into your carpet and remove the dirtEdge-Cleaning Side BrushGrabs dirt and debris from walls and other hard-to-reach areasMulti-Surface CleaningCleans hardwood, tile, linoleum, andlow-to-medium pile carpetAutomatic Surface TransitioningThe entire cleaning head adjusts automatically for both carpet and hard floor surfacesAutomatic Stair Avoidance SystemLeave Roomba by itself without worryingabout it falling down your stairsBagless debris bin (3 times larger!)Roomba's bagless bin now holds three times the dirtWall following (improved!)Teamed with the side brush, clean right up to the wallsRoomba Discovery is a luminous white, like a big, full moon.