... 1,Touch keypad,Big LCD display 2,GSM+PSTN dual network 3,8 wired + 30 wireless zones 4,Work worldwide Model ... 1. Touch keypad; Big LCD displays 2. GSM+PSTN dual network. If PSTN is disable, it will switch to GSM automatically ... More info,pls connect with us freely......... GSM+PSTN Dual-network Home Alarm System