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Fitbit Charge 2 review: a promising fitness tracker, plagued by bugs - The Verge
Fitbit Charge 2 vs Charge 3 vs Charge 4
Fitbit Charge 2 review: The best Fitbit yet - CNET
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Fitbit Charge 2 review: Sports tracking for the masses
The Fitbit Charge 2's upgrades are incremental, but necessary | Engadget
Fitbit Charge 5 vs Charge 4 vs Charge 3: The differences
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