... alarms & missing-alarmsAlarming Priority, log function, built-in back-up battery, AC/DC power both available5 Arm/Disarm ways of ... gsm sms alarm kit: Remote Controller, Host Keypad , Remote Controlling Keypad(options) , ... and SMS Internal&external antenna gsm intruder sms alarm kit Optional Technical Parameter:Main unit ParameterGSM frequency 900/1800MHZ ...