Honeywell 4219 Wired Eight Zone ExpanderNewest 4219 With Green Board Not The Older White Board Uses 2K Resistors Expands Vista 20P Or 21Ip To Have 8 More Wired Zones Easy Wiring To The Keypad Bus Simple Dip Switch Addressing To Select Range Of Zone NumbersFeatures of Honeywell 4219 Wired Eight Zone Expander Newest 4219 With Green Board (Not The Old..