... , auto dial, wat GSM/PSTN alarm panel with 2wired output which uses the SMS to control the wired outputthis SN2301GSM/PSTN alarm system ... /part armed zone. e.g. we can set zone 3 with delay timer, zone 4 without delay, or zone 2 is 24 ... main fails; Built-in siren, and timer Ic, the time keeps right after power off16. Remote control, listen in, speak, arm, disarm ...