... LCD displays the entire setup menu FeaturesThe advantages of the GSM Alarm System1)Two-way Voice communication are available;2)LCD ... armed, Partial Armed, Disarmed, Power status, Siren status and GSM Signal status.7)Auto-detect and report, SMS Switch is ... indicators, LCD and functional Buttons.Functions & Features of the GSM Alarm System1)GSM Frequency: Dual-Band(900/1800MHz), Quad-Band is optional ...