The Roomba(R) Plus 505 Combo Robot + AutoWash(TM) Dock delivers detailed cleaning with an edge. DualClean(TM) Mop Pads with PerfectEdge(R) extends the mop pad 18% closer(1) to edges. Dynamic dock auto-empties debris refreshes mop pads during mopping then washes and heat-dries pads and self-cleans when done to keep everything fresh. Disclaimers; (1)Compared to un-extended DualClean(TM) Mop Pad