For connection to 8, 16, 24, 32, or 64 EOL (4.7K) supervised contact closures. Includes 32 character LCD display and keypad, sixty hours of battery backup with built-in charger as well as tamper switch. Built-in lightning protection on each zone input (gas tube, impedance device, and transorb). DGM panels can be expanded up to 64 zones at any time in the field. Optional external keypad (up to 16 per DGM) provides delayed entry at zone. Use this panel if you do not intend to add relay control within the panel, but may intend to expand to the full 64 zones.