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Fitbit Charge 4 Advanced Fitness Tracker with GPS, Swim Tracking & Up To 7 Day Battery, Black : Amazon.co.uk: Sports & Outdoors
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How to Pair Fitbit Charge 4 with iPhone - Install and Add Device to Fitbit App on iPhone - Tutorial - YouTube
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Fitbit Charge 4 adds GPS but doesn't work with third-party apps - CNET
Fitbit Charge 4 Fitness Tracker Review: Twice as expensive as the Huawei Band 4 Pro and also twice as good? - NotebookCheck.net Reviews
