the only reasonable feature on this crap watch is its (advertised) heart monitor. and even then you can get a good pulse-oximeter for a lot, LOT less than the iwatch. and it runs on AAA batteries that you can replace! it has more features than the damn watch does!
Is that really a thing people use?
yup. they clip on one of your fingers and you get a little screen that displays heart rate and oxygen level, and a historic (past >5 minutes) chart of the levels.
No, not that, I mean the ones on watches. What use would you have for that?
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