Apple Inc. has restored its blood oxygen tracking feature on US Apple Watches after a years-long legal battle. The feature was removed in 2023 due to a patent infringement lawsuit filed by Masimo Corp. However, following a ruling by the US Customs, it will now be available again for those who purchased models with this feature disabled.
Source: https://www.bloomberg.com/news/articles/2025-08-14/apple-watch-blood-oxygen-tracker-returns-to-us-after-legal-win