... also provides an promptly,effective, low cost pre-alarm on high/low temperature and power dump. It ... MIC & speakers 4.SMS,auto dial GSM alarm function Wireless GSM alarm system , and on the high quality ... also provides an promptly,effective, low cost pre-alarm on high/low temperature and power dump. It ... MIC & speakers 4.SMS,auto dial GSM alarm functionWireless GSM alarm system , and on the high quality ...