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Hands-on: Fitbit's new Flex 2 and Charge 2 Activity Trackers, plus Blaze & Alta updates | DC Rainmaker
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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 Charge HR, Surge activity trackers can now detect workouts, better track your heart rate - CNET
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