Smartwatches use a flashing green light to measure your heart rate and a red and infra-red light to measure your oxygen saturation. The way it works is really clever, and this video demonstrates that.
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The bizarre flashing lights on a smartwatch#
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smartwatches #
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SpO2
Get your first month of KiwiCo free: https://kiwico.com/stevemouldSmart watches use a flashing green light to measure your heart rate and a red and infarred ...
