... : 315MHZ/433MHZ frequency: 900/1800MHz & 850/1900MHz (optional) 10 Hours GSM Alarm,wireless alarm,home alarm, GSM home alarm,wireless alarm ... /433M optional ).* GSM GSM frequency: 900/1800MHz & 850/ 1900MHz (optional) The GSM frequency of model no.G10E: 900/1800MHZ The GSM frequency of model ... ·One Siren·One AC Adapter·One Manual Wireless GSM home alarm system with GSM 900/1800MHz or 850/1900MHz