Home guard burglarproof system, sistemas de alarma, wireless gsm security alarms KI-PG40W-U2 is the upgraded one for KI-PG40W, which has below four points that KI-PG40W don't have: 1, 30 wireless guard zone, 4 wired guard zone, 1 wired connection for siren, 1 wired connection for NO relay output, 1 wired connection for 12v voltage output.2, ..