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Buy one set alarm product , you can get one pir detector or door sensor for free.

NEW GSM+PSTN home alarm system 868 with LCD display and touch keypad/self defense products1. Touch keypad: Bule back-up light; LCD display date, day of the week, Time, and current Armed status;2. GSM 2/4 Band Net transmission, phone audible alarming and SMS alarming; 3. 15 wireless zones. Support 2 more wired zones(Optional);4. Can preset up to 6 phone numbers and dial in sequence;5. Intelligent logic analysis technology, correspoding zone number and sensor name can be displayed;6. Record up to a 10 second greeting for the auto-dialer, then play the greeting back;7. Arm/Disarm the system by 5ways: SMS, Main Host(Keypad), Wirless keypad, keychian remotes, or even remotely by phones. (PSTN alarm don't support SMS);8. Available in AC/DC with Low-voltage Indicators;9. Learning sensors to alarm host, very easy operation;10. Support wireless "ding-dong"doorbell function(optional);11. Support CID uploading to CMS(Center monitoring Station), can use our GSM CID connector to have this function;12. Buit-in Li-lon backup battery, it will alert when low power or without external power supply. 13. Store up to 99 alarm records and 99 arm/disarm records Kits: 1 main panel, 1 wireless infrared (motion) detector, 1 wireless door magnetic detector,1 siren, 2 remote controllers, 1 power supply, 1 manual For occations: Villa,house,shop,small and medium store,car,hospital,school,library,bank,financial office,parking lot.

NEW GSM+PSTN alarm system with LCD display and touch keypad

1 SGS&GMC&FCC
2 14years manufacturer
3 two years warranty