Fitbit has revealed its latest take on the activity tracker, the Fitbit Flex, a new challenger to the Jawbone UP complete with Bluetooth 4.0 for real-time sync with a nearby iPhone, iPad, or Android device. The tracker slots neatly into a waterproof wristband, or can be removed and clipped on elsewhere, tracking steps taken, distance travelled, calories burned, and even sleep, and giving at-a-glance feedback on the wearer’s performance using LEDs.















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