Hazardous Area Telephone Overall Depth 2 1/4 in Overall Height 9 in Overall Width 5 in Volume Control Yes Indoor/Outdoor Usage Indoor Standards CSA Certified FCC TCB Number of Lines 1 Mounting Location Wall Enclosure Material Steel Enclosure Rating NEMA 3R Includes Enclosure Yes Facility Type Commercial Maximum Operating Temperature 140 Degrees F Minimum Operating Temperature -40 Degrees F Color Gray Resistance Properties Corrosion Resistant