The LED Refrigeration Light Power Controller is a static PWM dimmer. The dimming level is set using DIP switches, so light levels can easily be matched to other LED Refrigeration Light Power Controllers.8-28V DC input range. 4.1A or 100W power limit. Length: 2.8 in = 72 mm. Width: 1.3 in = 33 mm. Height: 0.49 in = 12.5 mm. Connector input for use with Cold Door 2 IP66 24V DC Power Supply, 100W, Connector Lead. Extends LED life and reduces power consumption. DIP switch settings for dimming level. 555Hz PWM frequency. 5-year limited warranty.