home Alarm Receiver display SMS in LCD Speaker and Microphone battery can work for 12hours GSM Frequency:900/1800/1900Mhz Alarm Receiver,GSM Receiver ... equips LCD, once it received the SMS alarm message, the GSM Alarm Receiver will display the SMS in the LCD, in the meantime, the ... is 900/1800/1900Mhz, Optional: 850/900/1800/1900Mhz. GSM SMS Alarm Receiver