FEATURES: FSK/DTMF system compatible, FSK auto-adjust real time Records 38 incoming and 5 outgoing numbers (max 12 digits) which can be reviewed, called back and deleted 3 VIP numbers setting Calculator (max 10 digits) and hold on music function 2digits of PABX access setting Auto-filter local area code, auto-add ??in IDD number when call back Pre-dialing function (max digits), dialed number editable built-in ordinary rings 3 steps lock, lock the number led by 0 and lock all numbers (except 110, 112, 119, 120, 122) Pulse/Tone dialing mode compatible, alarm clock, anti-steal function Hands free dialing and talking.