Does Apple Watch detect my heart rate?

Does Apple Watch detect my heart rate?

Yes, Apple Watch includes a specially designed sensor that uses photodiodes, LEDs, and infrared LEDs to detect the user's heart rate.

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The heart rate sensor is contained on the back of the Apple Watch case, within a ceramic cover with sapphire lenses. The custom heart rate sensor can provide data to a variety of health and fitness apps, and helps monitor daily activity.

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