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The first fit bit was invented in 2007 by James park and Eric Friedman, but it was released in 2009.
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Zip tracks steps, distance, calories burned, and provides the time of day.
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Flex tracks your sleep, steps, calories, distance, and it also has a silent vibration alarm.
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All of the same except they added navigation and many notifications.
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One the Alta you can receive texts messages and calls along with sleep tracking.
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The Blaze has most of the same features but now it tracks your fitness plan and the screen is much larger with side buttons.
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The Versa is the most recent fit bit to come out. It now has apps to download, more advanced phone notifications and workout routines.
