"FSK/DTMF double syetem;
long distants hand free chatting;
ordinary casster record;
main unitcan record when chat on phone;
automtic answer when ring,recorder funcation;
rings/free hands adjustthe voice;
can tell the coming in phone no by voice.and pager,;
built in orginal sing song,chord ringers,music key can choice;
show date.temperature and with voice;
IP funcation,can adjust 3different time