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Blood monitors heading in the right direction...

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I'd like to know the principles on how it works, and I suppose also there's a patent on the sensor.

If you look the last iPhone and a '90 Nokia carphone you could be amaze on how the miniaturization tech on radio progressed, and how they could get rid of the quartz filters and the stick antenna, and to have a battery so small...
 
It says an infrared light sensor reads the blood going through the skin is the key. I'd like to think that's possible.
 
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