The lawyer was concerned about the two symmetrical infrared sensors installed in the base of Roomba's chassis and charging dock. The charging dock emits two constant infrared beams, forming a region of overlap, with which the robot can judge its position and distance from the charging dock, gradually adjusting its direction of motion before finally returning to the dock.
律師表示，倫巴的機身底座和充電座同時裝有兩組對稱的紅外線感測器，充電座會不斷發射出兩道紅外線光束，形成一個重疊區域，機器人就可據以判斷所處位置與充電座的距離，而逐步修正行進方向，最後再回到充電座。