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The dormakaba compact readers operate in an electronic access control system. The compact reader is a device that reads a personalized credential via radio-frequency identification (RFID) or Bluetooth Low Energy technology. The compact reader reads identity information from the credential and passes it on to an access controller via an RS-485 interface. In an online solution, the access controller then grants or denies access to the credential holder. In a stand-alone solution, the compact reader performs the access decision. Model 91 04: The compact reader 91 04 is a mullion mount reader for outdoor or indoor use. Model 91 10: The compact reader 91 10 is a reader for use in indoor or in protected outdoor areas. Model 91 12: The compact reader 91 12 is a reader for outdoor or indoor use and offers an integrated PIN keypad for an added level of security.