Fitness
Green Light PPG Sensor
Green light PPG sensors are the common LED color under watch faces for heart rate—they absorb well in many skin types but struggle with motion and perfusion in cold weather. Red and infrared pairs on newer rings improve night and SpO₂-adjacent reads.
Green light PPG sensors are the common LED color under watch faces for heart rate—they absorb well in many skin types but struggle with motion and perfusion in cold weather. Red and infrared pairs on newer rings improve night and SpO₂-adjacent reads.
Clean the sensor window weekly.
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