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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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Amazon.com: Fitbit Charge HR Wireless Activity Wristband (Black, Large (6.2 - 7.6 in)) : Sports & Outdoors
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Fitbit debuts swim-proof Flex 2 & cardio-focused Charge 2 ahead of GPS-equipped Apple Watch 2 - 9to5Mac
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