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they are the same thing as i believe all of the fitbits have sleep tracking capabilities except for maybe the cheapest one which is a step counter only. for linking to any mobile phone they have a list on the fitbit website as to which phones they trackers can sync up too. all of the fitbits come with a usb sync device you can plug into your computer so you can sync it.
Sorry, there was a problem. Please try again later.There is only one Flex model.
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