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. Armored Cord. Keylock Door. Spring Door Return.