Auxiliary Relay, Compatible with Series Hubbell CU, Lighting Technology Fluorescent, Incandescent, Communication Method Hard Wired, Input Voltage 24V DC, Output Voltage 24V DC, Compatible with Brand Hubbell Wiring, Includes Add-A-Relay, H-Moss System, Lighting Controls, Switches, Standards ASHRAE 90.1, cULus Listed, Overall Depth 3.69 in, Overall Height 1.36 in, Overall Width 2.33 in, Maximum Operating Temperature 104 Degrees F, Minimum Operating Temperature 32 Degrees F, Color Black