Chord sing originally
Chord ringers
4 music key tones
Chord music beat color lamp of incoming telegram
Predial numbers,off-hook,incoming backlight
43 groups 12digits incoming numbers
9 groups 12digits outgoing numbers
3 groups alarms clock function
FSk/DTMF dual systems
Thunder protection and Anti-EMI
Wiretap protection,long distance key lock
Voice talking CID,transfer function
IP swift,keep secret dialing