The Mint® Automatic Robot Floor Cleaner uses the NorthStar® Navigation System to determine its location then builds a map of the area as it cleans, including walls, obstacles and drop offs. Mint® starts by cleaning open areas, then follows with a perimeter sweep along the edges of furniture and walls for a complete clean. When Mint® is finished cleaning, it returns to where it started and parks itself so you know right where to find it. Smart sensors help Mint® slow down before bumping walls and furniture, detect areas that are too low to enter, avoid area rugs and avoid falling down stairs. The special mopping motion gets deeper dirt and grime off your floor and PerfectEdge™ technology cleans along edges and walls. Mint® delivers whisper quiet operation and cleans up to three hours on a single charge. Includes charger, two dry microfiber cleaning cloths, one wet cleaning cloth, NorthStar® Navigation Cube, and two C batteries. UL listed.