Heart Rate Sensor in Apple Watch

Apple has detailed how the Heart Rate sensor in Apple Watch works.  Apple Watch uses green LED lights paired with light‑sensitive photodiodes to detect the amount of blood flowing through your wrist at any given moment. Apple Watch flashes its LED lights hundreds of times per second to calculate the number of times the heart beats each minute.

watch-heart-rate-monitor

For more information see:

https://support.apple.com/en-us/HT204666

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