Wiring Device-Kellems tradeSELECT® WS2000GY Occupancy Sensor Switch, 120/277 VAC, Passive Infrared Sensor, 1200 sq-ft Coverage, Wall Mounting

Requires a clear, unobstructed line of sight for detection, because it senses occupancy as movement of heat emitted from the body against the background space. A segmented Fresnel lens divides a coverage area into zones. Movement across zones is interpreted as occupancy. Excellent for small room control.