hi there. I'm planning on buying this cheap transportable flash unit for some shootings, but I just don't know what kind of transmitter I should get for it, knowing that I'm planning on using it mostly on a Nikon F3 and a bit on a Fuji XT3.

of course the best option would be something that'd work on any camera, and I'm pretty sure that this exists, but I just don't know where or what to look for.

I've looked around, I just can't seem to get a clear answer, I would appreciate any help on the matter, thanks