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Fitbit Charge 4 update shows SpO2 data on the band itself, tracks skin temperature - GSMArena.com news
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Fitbit Charge 5 comes with an ECG, EDA and many more sensors, brighter Always On display - GSMArena.com news
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Overnight spO2 is Interesting but why is it not displayed in the app? So you can see changes over time... : r/fitbit
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