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I don't see the screen dimension listed anywhere. Am I overlooking it or is that detail missing?

It’s a bit down on the product page.

The display is 7.5 inches.

I’ll update the description to make this more prominent.

Can you give me an idea of what a png/jpg would look like on one of these? I only see the calendar on the page...

It's a monochrome screen, pictures will probably need to be dithered to 800x480 1-bit, something like this: