Large LCD English blue back-light display, voice prompt, ease of use. Support GSM mobile network, provide redundancy for extra stability. Allow up to 99 wireless defense zones and 2 wired zones. Large LCD English blue back-light display, voice prompt, ease of use. Support GSM mobile network, provide redundancy for extra stability. Allow up to 99 wireless defense zones and 2 wired zones. Support configuration via keyboard, phone (handset ) or SMS messages to System. Different zones can dial a pre-set telephone number. 6 group voice alarm phone number for alert calling, 3 group phone number for help senior, 6 group for SMS messaging, numbers saved inside EEPROM without lost upon power failure. Support ISD automatic voice mailbox for playback message upon alert. Maximum length of voice message is 10 seconds. Telephone (phone) long-distance telephone control for arming, disarming, monitoring, remote announcement. 1 Set of normally open signal outputs, relay linkage output, home appliances remote control can be realized.