... ,then play the greeting back. 8.arm/disarm the system by 5 ways :SMS,main host(keypad),wireless keypad, ... .check door/window status automatically(this is when the system is dis armed ony,if a door is opened, ... . 16.built-in-li-lon backup battery,it will alert when low power or without extemal power supply. 17. ... pc. …Power Adaptor ~1 pc. Home Security GSM Alarm System wireless With LCD Touch Keypad CE,FCC