High-Impact Glass Reinforced Polyester Housing. NEMA 3R Weatherproof Rating. Sealed Metallic Braille Keypad. Anti-Corrosive Enclosure. Non-Moveable Hookswitch. Volume control handset. Noise canceling microphone. 6ft. Hytrel cord. Extreme Operating Temperature Range -40 C (-40 F) to +60 C(+140 F). FCC & IC Certified UL 60950 Listed. Hearing Aid Compatible. Spring Door Return.