These cards store crucial, non-erasable binary data and are primarily used in conventional security systems. These are more durable and use maximum interface.
These key cards have a magnetic strip on one side which contains employee credentials. The magnetic reader in the door is used to read that data and perform an action.
This method uses Radio Frequency Identification (RFID) to transmit data stored on the card to a reader. These can be customized to allow time limits and specific location permissions.