The Fitbit Charge 4 offers the company’s “most advanced combination of sensors and features” that includes the usual suite of sensors used for tracking a user’s heart rate and other vitals, along with a few new additions.
Beyond the inclusion of GPS, the Fitbit Charge 4 also features Fitbit Pay for NFC payments without using your phone, and there’s also an SpO2 sensor. That sensor is used to power Fitbit’s “Estimated Oxygen Variation Graph” in the Fitbit app.
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