Fitbit Charge 4 (and Charge 3) tips and features: How to use your new tracker

Getting started with the Fitbit Charge 3 or Charge 4 may be straightforward, but there are plenty of features that lie within the company's latest fitness tracker that are waiting to be discovered. And while it may not be as feature-packed as Fitbit's two smartwatches, the Ionic and Versa, the third-generation fitness band still has…

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