The TOE is composed of the modular software called ZEN-D and the OS service OpenVPNv2.4.4, which are embedded in the ARM board inside a safe manufactured by Sallén. ZEN-D is composed of a backend-frontend application and a set of drivers in charge of orchestrating the Sallén box peripherals. These drivers are also  embedded in the ARM board and are considered part of the ZEN-D application.

The OpenVPN service from the Operating System where ZEN-D software runs is considered a TOE component as it is in charge of providing the secure communication functionality. It communicates with CashControl Server and the remote users accessing by Remote Access functionality, in order to remotely manage the safe box by the ZEN-D software.