... choose from, you can set up common zones, home zones, intelligent zone, emergency zone, closed zones, ... APP or SMS remote host system settings.( iOS APP, just search " GSM alarm" from apple store)5. ... embedded artificial voice, when remote to answer alarm,the user can know the location of ... Siren's volume can be adjustable. G3+ GSM ALARM SYSTEM Specifications1. Wireless frequency: 315/433/868/915MHz, ...