Safety Technology International, Inc. STI-7521-HTR Heated NEMA 4X Polycarbonate Enclosure - Thumb Lock, Environmental Protective Cabinet For use in areas where freezing temperatures exceed operating range of important devices Constructed of super tough clear UV-stabilized polycarbonate LED indicators for "POWER" to unit and heat cycle "ON" Mounting hardware and gaskets included Three year guarantee against breakage of polycarbonate in normal use (one year on electro mechanical and electronic components)