... PSTN Call, GSM Call, GSM SMS alarm 1.Touch keypad; Big LCD displays2. GSM+PSTN dual network 3.30 wireless zones PSTN Call, GSM Call, GSM SMS alarm Feature:1 ... . Touch keypad; Big LCD displays2. GSM+PSTN dual network. If PSTN is ... of the worldUPS3-5 daysAll of the worldPSTN Call, GSM Call, GSM SMS alarm PSTN Call, GSM Call, GSM SMS alarm