4 Door Access Smart Controller, Board Only. Supports 4 Doors OSDP (8 Readers Entry/Exit) or 2 Doors Wiegand (4 Readers Entry/Exit) with 12 Contact Inputs and 4 Relay Outputs. With a cardholder capacity of 50,000 and up to 512 access levels per cardholder for granular security control, the acre Smart Controller can accommodate organizations of any size.