Twistlock Photocell | Dimmable: Non-Dimmable ; Operating Temp: -20c (-4f) to a Maximum of +45c (+113f) ; Nsf Approved: Yes - Approved | Fan Control (Left) Use Slide to Turn Fan On/off and Adjust Fan Speed. 3 Quiet Fan Speeds Designed to Prevent Motor Hum (For Use With One Ceiling Paddle Fan). Dimmer (Right) Toggle Turns Light On/off. Slide Up to Brighten, Down to Dim | Features: Electronic Photocell, Zero-Cross Technology, Led Fixtures Totaling 2220 Wtt @ 277 Vac, Non-Drifting Silicon Light Sensor Ir Filtered, Fail Mode: OnFurbay Electric Supp