... keypad,Big LCD display 2,GSM+PSTN dual network 3,8 wired + 30 wireless zones 4,Work ... keypad; Big LCD displays 2. GSM+PSTN dual network. If PSTN is disable, it will switch to ... + Alarm History + Status History 4. 30 wireless zones + 8 wired zones, every zone attribute, name, bypass, alarm delay ... , AC power off and recover, Low voltage, test) 8. Support wireless “ding-dong” doorbell function 9. Alarm ...