Twistlock Photocell | Dimmable: Non-Dimmable ; Operating Temp: -20c (-4f) to a Maximum of +45c (+113f) ; Nsf Approved: Yes - Approved | Features: Electronic Photocell, Zero-Cross Technology, Led Fixtures Totaling 2220 Wtt @ 277 Vac, Non-Drifting Silicon Light Sensor Ir Filtered, Fail Mode: On | Passive Infrared Sensors That Automatically Control the Lights in an Area. These Sensors Detect Heat From Occupants Moving Within an Area to Deterine When the Space Is Occupied. Combines a Maestro 0-10 v Dimmer With an Occupancy Sensor. Controls 1-10 VdcFurbay Electric Supp