With a water tank installed inside the machine, S5 Pro is capable of damp mopping to achieve spotless floors following vacuuming. S5 Pro is an auto-clean robot without navigation. As a best practice, please move away the chairs and objects that leave in the way of intended cleaning areas. The robot might repeat cleaning the same space if it detects the obstacles again and again in a very limited space. Please check the side brushes are stuck with cable or objects if the machine stops moving.