There is now a way to protect your signalling device located where temperature or environmental conditions exceed the suggested operating range. The stopper dome strobe heated enclosure is UL/cUL Listed down to -70°F (-57°C) and Type 4X Rated. Thermostatically controlled heater and a continuous duty fan maintain a uniform temperature in the cover when located in a cold environment. Applications include, but are not limited to, refrigerators, freezers, meat packaging plants, Arctic environments, ocean rigs, slaughter houses, etc. UL Listed to U.S. and Canadian safety standards and Type 4X Standards.