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