Enclosure Indoor Outdoor Color Clear Material Polycarbonate Mounting Surface Width 11 7/8 in Depth 12 in Height 4 7/8 in For Use With Wide Range of Devices Components and Sensitive Units Operating Temp -40 Degrees to 250 Degrees F Rating NEMA 4X Features Enclosure Designed to Maintain A Temperature Above Freezing Operates on 12 165 or 24 Volts and Has Three Thermostats Allows Protected Unit to Be Clearly Seen and Quickly Identified Includes Heater Thumb Lock