The SCALA solo mini-controller is separate and is installed in a secure area inside. This means that manipulation of the door from the outside is not possible.|When the system is first used, the mini-controller and the reader pair. This means that as soon as these components are connected and supplied with power, the components are irreversibly linked to form a system.|For greater security when using the 'PIN code only' operating mode, this can be increased from 4 to 6 digits.|In addition, the selection of the various operating modes offers different security levels depending on requirements. The 'ID card in combination with a PIN code' operating mode is the highest adjustable security level.|The SCALA solo set consists of a mini-controller and a reader with a PIN keypad.