The FitBit Zip is the least expensive.
It records steps taken, calories burned and distance traveled.
It clips on to pants, bra, etc.
The FitBit One is $99.00 and replaced the FitBit Ultra.
It records steps taken, calories burned, distance traveled, stairs climbed and quality of sleep.
It clips on to pants, bra, etc. or can be worn on wrist band for sleep recording.
The FitBit Flex is now being pre-ordered for $99.00
It records steps taken, calories burned, distance traveled, stairs climbed, activity level and quality of sleep.
It is a wrist band device.
The recording of the quality of sleep lets you know, how often you are waking up, how many actual hours of sleep you are getting, how long it takes you to get to sleep, etc. While in and of itself it can't improve your quality of sleep, I find knowing this info has helped me see areas of weakness in my sleep and helped me to work on areas that need improving.
Check out the website for Fitbit on Fitbit.com it really explains all the differences between the models. And no I don't work for Fitbit although I should own stock I have gotten them a lot of business!!
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