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. 6' Hytrel? cord. Extreme Operating Temperature Range -40?C (-40?F) to +60?C(+140?F). FCC & IC Certified, UL 60950 Listed. Hearing Aid Compatible. Keylock Door. Spring Door Return.