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 12 digits 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