The XR550 features 574 inputs, 10 On-Board Zones, 16 keypads = 64 zones, 5 built-in LX Bus (100 Zones per LX), and 10,000 user codes with 99 profiles. It provides ease of programming, dialer & network connectivity, systems integration, flash updates plus intuitive operation designed with end-users in mind. Includes 50VA transformer. Compatible with all DMP 1100X Series Wireless and Keypads including the 7800 Series. Supports the DMP App.