Touchkepad GSM home burglar alarm 1.868MHZ&433MHZ available 2.Store 99 alarm and arm/disarm records 3.Door chime function Main Features: ... screen7.10 seconds voice recording 8.Arm or disarm the system by 5 ways:SMS,main host(keypad),wireless keypad(optional ... .Built-in backup Li-Ion battery13.System self-check function, alerts of no SIM card,alarm host low power, external AC power ...