Did you contact Amazon about a missing manual?

Did yo try to search for one, probably this will work:
https://downloads.absima.com/english...-4-ENGLISH.pdf
It hs th same jumpersetting so I asume it is from the same manufacturer.

2nd search, based n the model number on the side of the case:
https://cdn.simba-dickie-group.de/do..._Regler_en.pdf