An in-depth review of Fitbit Flex, a stylish wireless activity and sleep wristband that tracks steps, distance, calories burned, and sleep cycle.
It was always just a matter of time before the folks at Fitbit turned their engineering skills towards a wrist-mounted step tracker. Announced at CES this year, the Fitbit Flex combines the step-counting technology that made its One and Zip products so useful, and places it on the wrist for convenience…
