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 ICES-003 Class A Number of Handsets 1 Number of Lines 1 Mounting Location Wall Caller ID No Enclosure Material Steel Includes Enclosure Yes Facility Type Commercial Maximum Operating Temperature 140 Degrees F