*Updated 2021* The passive infrared Extreme Temperature Sensor provides consistent, stable coverage where extreme heat, cold or humidity must be accommodated, and where there are wide fluctuations in temperature. Temperature compensating circuitry stabilizes sensitivity at temperatures –40°F to 125°F (-40°C to 52°C). Ambient light control circuit to avoid False ON/OFF from brief changes in background light. Lighting sweep function with selectable DIP Switch prevents unnecessary “lights ON” following power sweeps in facilities with computer control systems