Apple is gearing up to unveil the Apple Watch Series 11 next month alongside the iPhone 17 , but it has an early treat for some existing Apple Watch owners in the US today.

Thursday marks the surprise reintroduction of the Apple Watch blood oxygen feature, redesigned for some Apple Watch Series 9, Series 10 and Apple Watch Ultra 2 owners. The feature will be available via a software update that's rolling out now.

If you own one of these models and don't currently have access to the feature, you'll need to ensure your paired iPhone is updated to iOS 18.6.1 and that your Apple Watch is currently running watchOS 11.6.1. The updates will trigger sensor data collected from the Blood Oxygen app on your Apple Watch to be measured and calculated on your iPhone. The results can be viewed in

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