... adopts SMS data transmission and voice platform of GSM network to send control command and receive alarm ... time, date and the status of arm, disarm, GSM signal, power, alarm, etc. The specific functions ... or windows are closed or not2. Built-in SIMCOM, GSM module (SIM300 or SIM340)3. With color LCD ... centre15. Check host's status by SMS Specificationsa) GSM frequency:900/1800/850/1900MHz (Optional) b) ...