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Amazon.com: Fitbit Charge 4 Fitness and Activity Tracker with Built-in GPS, Heart Rate, Sleep & Swim Tracking, Black/Black, One Size (S &L Bands Included) : Sports & Outdoors
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Fitbit Charge 4 fitness tracker full specs revealed by online retailer including prices, colors, and NFC capability - NotebookCheck.net News
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FITBIT CHARGE 4 Full Setup (GPS, Clock Faces, Spotify, Payments, Apps, Notifications) & Unboxing! - YouTube
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