Features:
1) DC9V - 12V power supply, standby current less than 25mA
2) Six groups of alarm telephone numbers can be pre-stored
3) 10 seconds pre-recorded memo messages
4) Remote distance operation in via public telephone network set guard status 
    or withdraw guard to the main dialer
5) Remote distance listen in the field sound
6) Guard setting time delay option: 0 - 90 seconds selection
7) Alarm setting time delay option: 0 - 90 seconds selectable by user
8) Telephone line cut off alarm function option
9) Four wireless distinguishable guard zones on the main set
10) Siren time length control option: 1 - 20 minutes selectable by user
11) Each of four guard zones can be set on guard or withdraw guard independently
12) One panic key for help is provided on the main set
13) One panic key for help is provided on the remote controller which will make the
       main dialer give out loud sound as well as dialing when trigged
14) One panic key for help is provided on the remote controller which will not make
       the main Dialer silent but dialing out telephone numbers when being trigged
15) Convenient key input is prepared on the front panel
16) Various kinds of door magnetic switch and infra-red detector are matchable
17) Rechargeable DC 9V power transformer provided for power off backup