
When placed inside one of the included bands, it weighs 0.3 ounces. Smaller than the original Flex, the tracker itself measures just 0.2 by 0.4 by 1.3 inches (HWD) and weighs so little it barely registered on our scale.

Like Fitbit's Alta and Charge 2 ($149.95 at Fitbit) (Opens in a new window), the Flex 2 is essentially a tiny, rectangular module you can swap between various wearable accessories. It's a great entry-level tracker, though the Misfit Ray puts up a tough fight in the style department. The Flex 2 is slim and modular, so you can place the tracker portion in a variety of different bands and bangles. Instead of a display, there's a row of colorful lights that blink to indicate your progress and alert you of phone notifications. There's no built-in GPS or heart rate monitoring, but that's no surprise at this price point. It automatically tracks swimming, along with other activities like biking, running, and walking. The Flex 2 ($99.95) is Fitbit's first fully waterproof fitness tracker, as well as its slimmest.

How to Block Robotexts and Spam Messages.
