No. Of Onboard & Supported Zone: 6 To 8 Zone, No. Of Onboard & Supported Output: 5 Output, Max Keypad Support: 4, Keypad Display Type : LED Only, Support PC Programming: Yes, Support PSTN: Yes, Supported Partitions: 2, Supported Timer: 4, Maximum No. User: 14, Maximum Phone No: 4, Supply Voltage (±15%): 18 V AC, 50-60 Hz, Board dimensions: 142 x 102 mmen