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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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The new Fitbit Charge 3 features 24/7 heart rate so you can track calorie burn more accurately, optimize your workout… | Fitbit, Fitbit charge, No equipment workout
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