you are most welcome, and again anytime you need it:)
I had a good search around and it looks like yours is a standard version Pen, no battery and no Bluetooth.
basically it's just powered by the electricity around your device screen , that being said, that was how the first pens worked too and they are almost as good as the newest ones even today, I use a gen 2 similar to your one with my S21U.
hope you enjoy them both and remember the sides and apparently back too on your tablet has magnets that will hold your pen. no slot sadly.
Good luck with it:)
if this solved your question I'd appreciate If you mark it solved by post have a great day or night wherever you may be