Facility code 851 The PVC425 Omniprox ISO 25 Card Pack is a set of 34-bit proximity cards designed for access control purposes in businesses and industrial settings. These cards are equipped with a unique identifier and can be used to securely access restricted areas within a facility. The PVC425 Omniprox ISO 25 model offers a reliable and efficient way to manage and control access to sensitive areas, providing peace of mind for both employers and employees.