Addressable Fire Alarm Control Unit c/w 1 Addressable Loop (159 Sensors & 159 Modules) Expandable to three SLCs with the addition of the Dual Loop Controller ALC-636. 4 x 20 Character Back-Lit LCD Display 4 Class A/B (Style Z/Y) NAC Circuits Four Event Display Queues 10 Amp Power Supply c/w UB-1024DS Universal Backbox & DOX-1024DS RED Door Space for 2 RAX-1048TZDS LED Annunciator Modules * Standard RED Door