HP41 module PKSH ?

[Adalin]

Hello

I bought two HP41 calculators and some modules was included in the deal, mostly memory modules.

but one of the modules is a module with the name PKSH on the front

on the top its marked:
SETD0705

and on the bottom its marked:
82500B-A03
1982 CAT
ID 11/12 SINGAPORE

CAT 2 gives me:
PKSH
DUM1
DUM5
DUM3
DUM2
DUM6
DUM4
NAME
L*
L-

What can the use be for this module?

I cant find any info about it anywhere