DESC: The vacuuming robot returns to its self-charging Home Base to dock and recharge between cleaning cycles or when the battery starts to run low. Its advanced power system consists of a fast-charging battery, a three-hour charger, and a power source that supercharges the unit for up to 120 minutes of continuous cleaning, covering about three to four average-size rooms on a single charge. Other accessories include two Virtual Walls (that require two D batteries each), a brush cleaning tool, and an extra filter.