The ACP-iFDC is an Access Control Board for 4 doors. This is part of our newer generation of boards that can be powered with PoE (Power over Ethernet) or 12vDC. There are 8 Inputs and 8 outputs. Traditionally you would use the inputs for devices such as door sensors and exit buttons and the outputs would be for Door Locks and Alarms. 2 kinds of Door locks you could use are Electromagnetic Locks and also Electronic Door Strikes.