FIRST ALERT SFA3800 Big Button Corded Telephone with Emergency Key & Remote Pendant Get a hold of emergency responders and contacts with just the touch of a button! Wearable remote emergency pendant with 100-ft. range. Phone features talking dialer keys, 64 Caller ID memory, handset volume control, 3-line easy-to-read LCD screen. Phone uses either the included AC adapter or 4 AA batteries (not included). Pendant uses one 12-V battery (included). Desktop or wall mountable with included hardware.