Hazardous Area Telephone Call Waiting No Overall Depth 5 1/2 in Speakerphone No Overall Height 10 3/4 in Voicemail No Overall Width 9 1/2 in Volume Control Yes Indoor/Outdoor Usage Indoor Outdoor Standards cULus IEC 61000-6-2 2005 Industry Canada ICES-003 Class A Number of Handsets 1 Number of Lines 1 Mounting Location Surface Caller ID No Enclosure Material Plastic Includes Enclosure Yes Maximum Operating Temperature 140 Degrees F Minimum Operating Temperature -22 Degrees F