High-Impact, Glass Reinforced Polyester Housing. NEMA 3R Weatherproof Rating. 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. UL60950 Listed. Hearing Aid Compatible. Keylock Door. Spring Door Return.