... :REH3201.Use SIM900B GSM module---industrial module .Two-way to communication,to talk with people who are ... can arm, disarm, panic from long distance. 9. Can control the system by using a telephone ... installed and operated 12. With inner back-up battery, when the power is off, it still ... or 315MHZ,GSM 900/1800MHZ,or 850/1900MHZ for special orderOperating voltage:DC12V,AC220/110VWireless receiving ...