... callings alarm 2)GSM frequency:900/1800Mhz or 850/1900Mhz 3)Wireless keyboard Wireless GSM Home Alarm System with wireless and wire protection ... zones(LS-GSM-001) I. GSM alarm system Features ... 1 Main panel,1 GSM antenna,1 wireless PIR detector,1 wireless keyboard,1 Wired mini siren,1 Wireless door detector,1 ...