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Fitbit's Charge 4 review | CNN Underscored
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How to stream Spotify music on your Fitbit - The Verge
Fitbit Charge 4 tracker adds onboard GPS and Spotify control
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Fitbit Charge 4 vs Charge 3: 4 big upgrades you need to know about
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Fitbit Charge 4 vs Charge 3: Is the newest do-it-all fitness tracker a worthy upgrade? | Macworld
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