Apple Watch pairing with iPhone 7SE
I’m looking for the latest Apple Watch I can pair with an iPhone 7SE. A watch that has the blood oxygen indicator. What number can I get?
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An iPhone series 6S and 7, and SE 1st generation can update to iOS 15.7.7. A series 8 Apple watch will come with watchOS 9 which requires iOS 16. Therefore any series 7 watch or earlier should work if it hasn't already been upgraded to watchOS 9. However, to use the blood oxygen feature you will need a series 6 or 7 watch. See:
How to use the Blood Oxygen app on Apple Watch - Apple Support