The LED Refrigeration Light Dimming Controller is a UL listed occupancy-sensor based dimmer for LED refrigeration lighting. It requires either the LED Refrigeration Light Occupancy Sensor or LED Refrigeration Light Wide Angle Occupancy Sensor to function. The dimming controller allows separate dimming levels to be set for occupied and unoccupied states. DIP switches are used to set dimming levels, so multiple Dimming Controllers can easily be matched. 8-28V DC input range.4.1A or 100W power limit. Length: 2.5 in = 64 mm. Width: 1.26 in = 32 mm. Height: 1.73 in = 44 mm. Connector input for use with Cold Door 2 IP66 24V DC Power Supply, 100W, Connector Lead. Ambient temperature range: -40°C to 50°C. Available standard or wide-angle occupancy sensors. Extends LED life and reduces power consumption. 555Hz PWM frequency. Integrated mounting tab. UL IFDR Listed. 5-year limited warranty.