Consistent leaks and rumors have suggested the Apple Watch 6 is set to come with sleep tracking and blood oxygen monitoring features, and it seems those two features may come to other smartwatches too.
According to trusted sources speaking to The Verifier, watchOS 7 and the Apple Watch 6 is where we’ll see the new features debut. That means these features may also be available on your current Apple Watch, when the software rolls out.
That won’t be the case for much older devices though. This report says the Apple Watch 3 and above will get access to the new tools, suggesting the Apple Watch 2, Apple Watch Series 1 or the original device won’t be compatible with watchOS 7.
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https://www.techradar.com/news/apple-watch-6-looks-set-to-track-sleep-but-watchos-7-may-not-work-with-your-watch
