The redesigned version of the feature will be available on the Apple Watch Series 9, Series 10, and Ultra 2 after users install the watchOS 11.6.1 update on their watches and the iOS 18.6.1 update on their paired iPhones.
Apple says that watches outside the US won’t be affected by the update, since they were never subject to the US import ban in the first place. It also won’t affect Apple Watches purchased in the US before the import ban went into effect—Apple never removed the feature from watches it had already sold, so if you bought a Series 9 or Ultra 2 watch in the fall of 2023 or if you’re still using an older watch with the blood oxygen monitoring feature, the updates won’t change anything for you.
Masimo originally sued Apple over the blood oxygen monitoring feature in January of 2020. According to Masimo, Masimo and Apple had initially met in 2013 to talk about a potential partnership or acquisition, but Apple instead poached Masimo’s engineers to implement the feature on its own without Masimo’s involvement.
