Due to a patent dispute with Masimo, new Apple Watch Series 9, 10, and Ultra 2 units sold in the US no longer have the blood oxygen feature.
If you're interested in more premium materials, like stainless steel, this is a great way to get a fancier version of last year's watch.
The past few years have seen iterative updates in terms of hardware - and the bulk of new features come from software updates.
Buying refurbished is one way that you may be able to upgrade from an older model without giving up blood oxygen.
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