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Fitness trackers utilize similar technology, featuring a green LED and a photodetector that measures the intensity of light passing through your skin and tissue, which, in turn, depends on the blood volume beneath your skin changing with every heartbeat. https://t.co/rcdb4unpxY — Curious Miller (@CuriousMillerX) November 1, 2023 " src="https://platform.twitter.com/embed/index.html?dnt=false&...
How fitness trackers work
Nov 01, 2023
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