High-Impact Glass Reinforced Polyester Housing. Non-Moveable Hookswitch. Volume control handset. Noise canceling microphone. 6ft. Hytrel cord. Sealed Metallic Braille Keypad. Extreme Operating Temperature Range -40 C (-40 F) to +60 C(+140 F). FCC & IC Certified UL60950 Listed. Hearing Aid Compatible.