You can pick upfor $399.99 ($400 off), its lowest price ever, at Amazon . The robot vacuum / mop hybrid sucks up debris and uses a side brush to clean edges and corners of your room before its pair of spinning mop pads clean stuck-on gunk. The 405 plans the most efficient route by mapping your home using lidar sensors, and you can adjust which rooms or areas it cleans using the Roomba Home app. The app also allows you to set a cleaning schedule or select a cleaning mode. After cleaning, the robovac can automatically return to the included charging base and deposit debris and dirty water inside the dock (in separate reservoirs, of course).