... be programmable >>Supporting voice monitoring>>Internal Ttemperature sensor (*optional)>>Being available for internal battery and providing power cut off alarm ... n,8,0,1>>Temperature: -20-+70 °C>>Humidity : Relative humidity 95% (condensation free)>>Output drive voltage: Equal to ... System, GSM SMS Alarm, GSM SMS Controller, GSM Home Automation system, Industrial Remote Controller, GPRS RTU Data Logger, ...