I can understand the heart rate part since watches are worn on the wrist, where our pulse can be determined, though I’m not quite sure, but what about the other vital signs? how?
In: Technology
it uses a light and a light sensor to measure your blood pumping through your veins.
you can test a very basic way by turning on the flashlight of your phone while recording video and then resting your finger against the camera sensor while covering the flashlight with it, you will see it changes the shade of color in a pattern, that pattern is your heart rate
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