At the CES event in Las Vegas this week, Fitbit unveiled a new Bluetooth Smart-enabled, wrist-worn activity tracker, called Fitbit Flex. Like most of Fitbit's other trackers, the Flex also promises to ...
The biggest difference between the Fitbit Flex 2 and the Fitbit Flex is that the new device is sufficiently water-resistant to be worn while swimming and to track laps and calories burned while ...
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