... 315M or 433M (optional frequency:900/1800MHz or 850/1900MHz LCD screen GSM Alarm,wireless alarm,home alarm,GSM home alarm ... securityDescription and Main functionsFeatures: 01,Simcom GSM module 02.Color LCD screen, keypad with color background light. 03. Maximum 24 ... power consumption:less than 3WStandby battery:DC 7.4V, 800MAHOperating temperature: -20°C ~ 60°CHumidity: 20% to 95% Wireless GSM home ...