A shortcut to returning to life with a Roomba without replacing it or expensive repairs. Revive a Roomba that has stopped working due to a board or sensor failure. It can be used by replacing the necessary parts. This is only the main board base unit (without screws). The following parts are required for use: ・Front wheel ・Tire modules (left and right) ・Edge brush module ・Main brush module ・Brushes ・Dust box (for 890/891/892/893) ・Battery ・Home base ・Four back cover screws