Auto-ON/Auto-OFF PIR occupancy sensor (manual ON/Auto-OFF selectable) lighting control, vandal-resistant, manual wall switch. robust single latching 10 A relay, no-neutral wire required. The ODS10 uses passive infrared (PIR) detection technology to monitor a room for occupancy through a segmented Fresnel lens. This specialized lens divides the field-of-view into sensor zones. When a person passes into or out of a sensor zone, the sensor detects motion and switches the lights ON. The lights will remain ON as long as there is an occupant moving through the sensor zones. Segmented fresnel lens provides optimum sensitivity and performance Designed with an extensive "minor motion" area where even slight body movements will be detected Vandal-resistant pir lens Horizontal field-of-view may be adjusted between 180 deg and 60 deg of arc by using integral blinders located on either side of the lens No masking tape required