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Heart rate (green light) sensor flickering when checking heart rate. Feature, bug, or faulty unit? : r/watchOSBeta
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Just found out that the heart rate sensor has more then just the red LED,it has blue and green too,found out in the test menu : r/GalaxyNote9
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PulseOn sensor solution combines green and IR light with optimally... | Download Scientific Diagram
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Red Light, Green Light!
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