Apple has announced the return of its blood oxygen monitoring feature to Apple Watch models in the U.S. following a significant legal battle involving patent disputes with Masimo. This feature, which was previously removed, has been redesigned and is now available as part of a software update for several models, including the latest Series 9, 10, and Ultra 2. Apple aims to restore this key health tracking capability, which had been absent for 18 months, providing users with important health insights once again. The rollout is seen as a major win for Apple as they navigate the legal complexities surrounding the feature.