Easy to set up - This telephone work without power. Insert one connector of the phone cord to the connection of the base marked LINE and the other end to the telephone line of wall connection. Desktop Landline -  Compatible with DTMF/FSK caller ID. And 16 Digit LCD/Last Number Redial/43 Incoming Calls (16 digit) Memory/12 Outgoing (12 digit) memory. Big LCD Screen - Powered by 3*AA Batteries (not included), can display and setting Year & Month & Date & Time. And 3 screen contrast levels can be adjusted as well. Multi-function - Comes with 16 kinds of ring music to select, and 3 alarms setting, support setting 4 ringer volume levels and 2 speakerphone volume levels. Interesting & Better than Other Landline - Speakerphones button makes hands-free conversations easily. Music on hold. Support Calculator function.