First Alert SFA3275 1-Handset Landline Telephone 4 Photo Speed Dial Keys, 1 SOS Emergency Key, Speakerphone up to 16.5' Range, Auto-answer for 5 Specific Preset Caller ID Numbers Message Waiting and Incoming Call Indicator, 76 Caller ID Memories, 80 Phonebook Entries, Last 16 Dialed Numbers Review and Redial Hold with Mute/Music and Extension Release, Automatic Call Timer, Flash Time (100/300/600/900MS) Adjustable, On-hook Predial Handset 4 Levels Volume Control, Speaker/Ringer 8 Levels Volume Control, 16 Digits and 16 Characters LCD Display with 5 Levels Contrast Adjustment, Multiple Languages Support Hearing Aid Compatible, Desktop and Wall Mountable, Battery Back-up: 4 x "AAA" (UM-4), Batteries Required (not included)