The watch’s sensor works in tandem with the health-centered Zepp OS 2.0 to provide 24-hour monitoring of your heart rate, blood-oxygen saturation (SpO₂), and stress level. You can also simultaneously test these three metrics in one tap, for a result in as quick as 45 seconds.

Engage the Sleep Mode when it’s time to rest, and the watch will reduce display brightness and disable notifications. It can track your sleep quality through the light, deep and REM sleep stages, as well as your sleep breathing quality – and can even track daytime naps.