Stopper Dome Heated Enclosure for Strobe Only Type 4X Hazardous Locations helps protect strobe units where temperature or environmental conditions exceed the suggested operation range. That includes, but are not limited to, refrigerators, freezers, meat packaging plants, arctic environments, ocean rigs, slaughterhouses, etc. Three year guarantee against breakage of polycarbonate in normal use (one year on electro mechanical and electronic components).