Hazardous Area Telephone, Call Waiting No, Overall Depth 2 1/4 in, Speakerphone No, Overall Height 9 in, Voicemail No, Overall Width 5 in, Volume Control Yes, Indoor/Outdoor Usage Indoor, Standards cULus 20140826-E357080, FCC Part 15 Class A, IEC 61000-6-2:2005, Industry Canada KES-003 Class A, Number of Handsets 1, Number of Lines 1, Cord Length 20 ft, Mounting Location Wall, Caller ID No, Enclosure Material Steel, Includes Enclosure Yes, Maximum Operating Temperature 140 Degrees F