GMS modem frequency 850/900/1800/1900 MHzPower supply voltage 16-24V AC or 18-24V DCOn-board zones 6 (12 in ATZ mode). *Possibility to increase to 44PGM outputs 4. *Possibility to increase to 44Supported protocols ADEMCO CONTACT IDWays of configuration SMS, USB, Internet, keypadOperating temperature..