1, PSTN & GSM security alarm with LED display and keyboard 2,99 wireless and 2 wired 3,Voice prompt function 1, PSTN & GSM, Voice ... live arm, disarm, monitor, intercom, a / wireless appliance control output, system settings and other functions. 16, SMS remote control functions; via ... , field, and so on, wired telephone networks can not reach. GSM security alarm system with LED display and keyboard ...