Some Apple Watches have had blood oxygen monitoring disabled by Apple in response to a lawsuit. That changes today.

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The smartwatch's Blood Oxygen app lets you measure the oxygen level of your blood on-demand. It's been MIA for more than a year thanks to a patent spat, but it's back in action now.

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In a surprise Thursday announcement, Apple says that it is bringing the blood oxygen sensor feature back to the Apple Watch ...

After an 18-month hiatus, blood oxygen monitoring is returning to the Apple Watch in the United States. Apple formally ...