Features FSK/DTMF dual system Auto switch 16 incoming reviewed calls, 16 new calls and 30 outgoing calls and redial back 12 digits LCD double display, LCD contrast adjustable Hand-free dial and speak Talking Caller ID Number Talking hours when just reaching 10 kinds of hold music selection 10 kinds of ringer available 10 two touch memories (optional) Auto-IP function (optional) LCD and keypad backlight (optional)