728EX4: 4 zones, 728E: 6 zones(4 on-board inputs+2 Keypad zones)
728:10 zones(4 on-borad inputs with ATZ = 8 zones+Keypad zone

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728EX4: 4 zones, 728E: 6 zones(4 on-board inputs+2 Keypad zones) 728:10 zones(4 on-borad inputs with ATZ = 8 zones+Keypad zones) 748: 24 zones( 12 on-borad inputs with ATZ = 24 zones including 2 keypad zones)748EX:14 zones(12 zones on-borad inputs +2 keypad zones) 738:14 zones(6 on-borad inputs with ATZ = 12 zones+ 2 keypad zones) 738EX: 9 zones(7 on-borad input + 2keypad zones) "False Alarm Prevention" features such as Itellizones, Auto Zone Shutdown. Beep on Exit Delay 2 Flexible Partitions High-Speed Communication Formats 256 Event Buffer with time and date stamp 2 fully programmable output(PGMs) Upload & Download capability Espload Software Alarm Relay User codes+1 Master Code+1 Installer code Telephone line Supervision 3keypad activated panic alarms Regular arming,"Stay" Arming,"Double Stay" Arming,Force" Away" Arming,"one-key" Regular