【Junk】Casio Random Access Memory RC-4

This is a used item, so please read the description below and only consider purchasing if you understand and agree.

I apologize, but my memory is not clear, and I believe this is likely a memory for a Casio pocket computer.
I cannot confirm its operation as I do not have the main unit. It has been stored in a drawer for decades, so I assume it is unusable and am listing it as junk.

It will be wrapped in plastic for waterproofing and shipped via Nekoposu.