ProdataKey PDK R4E Red — 4-Door Expansion Board

PDK R4E Red by ProdataKey is a four-door expansion board that adds support for four additional doors to a PDK access control setup. This red expansion module is intended for integration with ProdataKey controllers to expand system capacity while keeping existing hardware in place. Compact and purpose-built, the PDK R4E Red provides a straightforward way to scale access control for small to mid-size installations.