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Fitbit Charge 4 Advanced Fitness Tracker W/ Built-in GPS, Fitbit Pay, 24/7 Heart Rate Tracking, Sleep Score, 7 Days Battery - US Model (Black & Blue S/L Bands Included) Storm Blue
Fitbit Charge 4: powerful fitness tracker let down by its poor screen – in black and white – and connectivity issues | South China Morning Post
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The Fitbit Charge 4 is official with built-in GPS and a few other cool tricks up its sleeve - PhoneArena
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