The XR550 features 574 inputs, 10 on-board zones, 16 keypads equaling 64 zones, five built-in LX-Bus (100 zones per LX) and 10,000 user codes with 99 profiles. It provides easy programming, dialer and network connectivity, systems integration, flash updates, plus intuitive operation designed with end users in mind. Includes 50 VA Transformer. Compatible with all DMP 1100XH Series Wireless and keypads. Supports Virtual Keypad.