Clear and distinguishable for speech sound 
FSK/DTMF dual system auto switch 
62 group Caller ID message memories 
16 group outgoing message memories 
3 group one-touch dialing memories 
5 digit of local area code 
Flash tome 100/300/600/1000ms selectable 
Music on hold function 
5 levels of LCD contrast adjustment 
12 digits of number of incoming call display 
15dB speakerphone volume control 
Ringer of outside and inside option function, incoming call indication 
In use indication 
RJ-11 and 2.5mm jack