For connection to 8, 16, 24, 32, or 64 EOL (4.7K) supervised contact closures. Expandable to 64 zones at any time. Includes 32 character LCD display and keypad, sixty hours of battery backup with built-in charger as well as tamper switch. Includes built-in lightning protection on each zone input. Panel has space allocated to accommodate two 8 relay output cards that must be ordered separately. Unit will accommodate up to eight relay modules with additional enclosures or piggybacking modules in same enclosure. Optional external keypad (up to 16 per DGM) provides delayed entry at each zone. Use this panel if you intend to expand to 64 zones, and want relay control now or at a later date.