Its the stunt, or a static version of the hero prop, this one was probably just the static part as attached to the belt, the stunt foam ones had different colored screens and the hero ones were much more detailed and had removeable insides so that they could simulate the reader screen with lights.
I think this is fake too.
I know someone who used to make them.
JUDGE DREDD (1995)<BR>Judge Unicard Reader - £295.00 : Propmasters.net