Introducing the Von Duprin 900-4RL Relay Distribution Power Supply Board, designed to enhance your security systems with its advanced features. This versatile power supply board operates universally on 120-240 VAC and includes a battery backup that automatically selects the appropriate voltage. With a 4 relay configuration and integrated logic, it efficiently manages security interlocks, automatic operators, and time delays. Additionally, it offers an optional fire alarm emergency interface relay for added safety. The built-in monitoring circuit provides real-time AC input and DC output status through LED indicators, ensuring you stay informed. Upgrade your security setup today with the Von Duprin 900-4RL and experience reliability like never before!