GSM Alarm System 1.Voice and message alert 2,Set alarm ON or ... 2 0107152.9). GSM Home Alarm System with built-in PIR sensor Feasures and Functions:GSM 900/1800/1900 bands, can ... be used in most parts of the worldMonitor the scene environmentVoice and message alert Set alarm ON ... controllerCan set Home Arm and Out Arm modeCall in to set alarm ON, OFF, Monitor, Output, and Intercom.Send SMS ...