Remote battery powered LRF2-OCRB-P x 2 mounted on ceilings in each stairwell, commercial building. Batteries all tested good. Typical switch location gang boxes have cover plates and are spliced straight through. Can't find any other controls in gang boxes or behind fixtures. What other components could those sensors be communicating with? They also stay on and have to be turned off manually with the push button located on the motion sensor body.