pay4save Wireless GSM Home Security Burglar Alarm System Auto Dialing Dialer SMS Call GSM 850/900/1800/1900 bands,can be used in most parts of the world; Full duplex communication with the host;Send SMS to set alarm Monitor the scene environment;Can set Home Alarm and Out Alarm mode; Phone SMS alarm at the same ;Call in to set alarm ON,OFF,Monitor,Output,Intercom; Voice and message alert;Set alarm ON or OFF by remote controller;