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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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First Look: Fitbit Charge 3 Activity Tracker with SpO2 Sensor & Sleep Disturbance Tracking | DC Rainmaker
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Fitbit rolls out SpO2 blood oxygen monitoring feature: How it works, use cases and more | Technology News - The Indian Express
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