The Galaxy Watch5 and Watch5 Pro are some of the first smartwatches that support 'Watch Unlock', a long-awaited feature that Google originally debuted with Wear OS 3 as Smart Lock. While the feature is not live yet, it has already reached Galaxy Watch5 series models that have been updated to One UI 5 Watch and Wear OS 4.https://www.notebookcheck.net/Samsung-Galaxy-Watch5-and-Galaxy-Watch5-Pro-support-Watch-Unlock-before-new-feature-s-official-launch.747482.0.html
No Watch 4? It also got WearOS 4...