Cover is UV-stabilized against sun deterioration. Unlimited lifetime guarantee against breakage to the polycarbonate cover and frame, in normal use. Proven effective for almost two decades. STI-1200 is for flush mount pull stations (Surface - see STI-1230). UL Listed to U.S. and Canadian safety standards (for standard and custom labeling). Polycarbonate rated -40ºF to 120ºF (-40ºC to 49ºC). MEA 49-00-E. Fits virtually all manual pull stations (see Technical Data Sheet for dimensions)