1, PSTN & GSM security alarm with LED display and keyboard 2,99 wireless and 2 ... , Voice prompt function ,the use of industrial GSM / GPRS communication module 850/900/1800/1900MHZ options, global coverage.2, IMEI code ... for garage, warehouse, field, and so on, wired telephone networks can not reach. GSM security alarm system with LED display and keyboard,, security alarm system ...