The Fitbit Flex may have been superseded by the newer Fitbit Charge and Fitbit Charge HR, but one of the company's best trackers is still a popular option thanks to lower price points and its reliability.
Announced at CES back in 2013, 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.
This big design change has some pretty big advantages. For a start, the fear of having the small sensor pop out from a pocket while walking is gone. With the wrist mounted option, you always know where the device is.
The second major benefit is for sleep-tracking. While the Fitbit One offered the ability to track sleep by slipping the sensor into a soft, velcro arm band, the Flex leaves the sensor permanently attached, allowing you to switch modes without removing the device at all.
Unlike the Jawbone Up, the Flex consists of two separate parts - the sensor and the strap. The sensor itself is smaller than the One, thanks to the fact that it doesn't include an LED display.
Instead, five LED lights indicate the number of steps taken during a day, and are only activated by double tapping the device.
The rubber wristband is lightweight, but a little simplistic in its design. Unlike a watch strap or even a bracelet, the Flex uses a plastic grey latch to poke to plastic prongs into a series of holes on the band.
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