Roger Mobile Key is an app for mobile device which enables user identification in RACS 5 access control system and RCP Master 3 Time & Attendance software. The transmission between app and terminal can be conducted through BLE (Bluetooth), NFC or QR code displayed on mobile device screen. In case of BLE identification the mobile device can communicate in a distance of a few meters so this method can be used at driveways and gates to avoid user stepping out of the car for the purpose of identification.