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Amazon.com: Fitbit Charge 4 Special Edition Fitness and Activity Tracker with Built-in GPS, Heart Rate, Sleep & Swim Tracking, Black/Granite Reflective, One Size (S &L Bands Included) : Sports & Outdoors
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Amazon.co.jp: Fitbit Charge 4 FB417BKBK-FRCJK Fitness Tracker with GPS, Black/Black, L/S : Electronics
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Fitbit unveils Charge 4 tracker with GPS, heart activity tracking feature for workouts | MobiHealthNews
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