Hi I have a question on my apple watch ultra. Are only two sensor light suppose to be flashing or all four
Hi, I have a question on my apple watch ultra. Are only two sensor lights supposed to be flashing or are all four
Apple Watch Ultra
Question marked as
Which emitters (green, red, or infrared) are illuminated depend on what is being measured.
Commonly, you'll see a pair of the same color illuminated.
Monitor your heart rate with Apple Watch - Apple Support