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
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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