4-door access controller for offices, factories and buildings: connects up to 12 card readers (RS-485, Wiegand or OSDP), 4 locks, 4 door sensors and 4 exit buttons, and stores 100,000 cards and 300,000 events. Advanced rules like anti-passback, interlock and multiple authentication, full door alarms, encrypted TCP/IP, and it keeps working offline. Built-in 100-240 VAC power in a metal case with backup battery support. Scroll down for details.