Best Fitbit Charge 4 (and Charge 3) bands: Leather, metal and sport straps - Wareable
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Fitbit launches the Charge 4 with built-in GPS, few other reasons to upgrade | Macworld
It's Official: Spotify On Fitbit Is Music To Our Ears - Fitbit Blog
The new Fitbit Charge 4 brings built-in GPS to your wrist for just $150 | Android Central
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Amazon.com: Fitbit Charge 3 SE Fitness Activity Tracker Graphite/White Silicone, One Size (S and L Bands Included),1 Count (Pack of 1) : Sports & Outdoors