Re: Microphone adapter
"How difficult or expensive would it be to put in a 3.5 mm headphone slot. "
Probably because "splash proof".
"I saw no mention in the article of a SD card either."
I'm guessing e-sim means no physical SIM and without looking into it, a non-replaceable battery so no internal access for an SD card and no external SD card slot, all because "splash proof"