First Alert SFA3800 Big Button Telephone with Emergency Key and Remote Pendant Message Waiting and Incoming Call Indicator (LED and Icon), Adjustable Flash Time (Preset to 600MS), 3 Line Back-lit LCD Display (14 Digits Number, 16 Characters Name), Clock 3 One-touch Keys with Auto Emergency Dialing Function, Talking Dialer Keys, Rotary Knob on the Base for Headset Volume Control, SOS Emergency Remote Pendant with Working Distance up to 100' Talking CID with 30 User Recordable Memories, 64 Caller ID Memories (Type II), Last Numbers Review and Redial, Hold with Mute and Extension Release, Automatic Call Timer, On-hook Predial Speakerphone, Tone Frequency Control, Speaker/Ringer Volume Control, 11 Languages Support (English, France, Spanish, Italian and more), Pre-recorded Voice Prompts (SOS Emergency Message) Hearing Aid Compatible, Desktop and Wall Mountable, Power: 120V AC Adaptor (Included), Battery Backup for Display: 4 x 'AA' (UM-3)(Not included), Pendant: 1 x LR23 12V Battery (Included)