A case for my battery powered mailbox sensor.
Cr2032-holder will fit in the batteryholder (https://www.ebay.de/itm/5-x-Batteriehalter-Knopfzellen-Adapter-schwarz-f%C3%BCr-CR2032-3V/162648089313?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649).
The author hasn't provided the model origin yet.