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The red light sensor on my Ionic suddenly turned on today—is Fitbit secretly measuring my SpO2 or other data? : r/fitbit
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Fitbit Debuts Sense, its Most Advanced Health Smartwatch; World's First with EDA Sensor for Stress Management, Plus ECG App, SpO2 and Skin Temperature Sensors | SME Tech Guru
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First Look: Fitbit Charge 3 Activity Tracker with SpO2 Sensor & Sleep Disturbance Tracking | DC Rainmaker
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