Why does the under side of my Apple Watch glow red?

on occasion I notice the under side of my Apple Watch has a red light. What does that indicate?

Apple Watch Series 8, watchOS 9

Posted on Jul 31, 2023 9:01 AM

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Level 9

56,819 points

Aug 1, 2023 6:40 AM in response to Nana1950questions

The Apple Watch uses light based sensors to see through your skin as a way of detecting your heart rate pulse, VO2 levels, etc…

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Why does the under side of my Apple Watch glow red?

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