3-Stage Cleaning SystemiRobot Roomba 615 Robot Vacuum features a 3-Stage Cleaning System that loosens, lifts, and suctions dirt, dust, and hair from hard floors and carpetDual multi-surface brushesDual multi-surface brushes work together to grab dust, dirt, and large debris and the auto adjust cleaning head automatically adapts its height to effectively clean both carpets and hard floorsDirt Detect™ sensors Dirt Detect™ sensors alert the Roomba robot vacuum to clean more thoroughly on concentrated areas of dirt(such as high traffic zones of your home)Full Suite of Sensors Features a full suite of sensors to intelligently navigate the robot under or around objects and under furniture to help thoroughly clean your floorsEdge Sweeping brushEdge sweeping brush is specially designed at a 27-degree angle to sweep debris away from edges and cornersRuns Up to 90 MinutesRuns for up to 90 minutes before automatically docking and rechargingBuilt using over 25 years of robotics expertise and innovation