Fitbit devices use an accelerometer to measure your movements. The accelerometer takes the movement data and translates it into digital measurements, which it how Fitbits count your steps, and measure the distance you've traveled, calories burned, and sleep quality.
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You wear it on your wrist after you charge it up via the usb charger.
You download fitbit app on your phone and then add fit bit to phone .
I am not sure how it works I am guessing it has a motion detector in it and each step causes a vibration it detects.
It must have some sort of a pulse sensor as it also knows when you are a sleep .
you need to set up an account using an email address with fitbit via the app.
there is also a windows app but you need the fit bit dongle that comes in the box it came with plugged into the usb port of p.c.
even thoug pc has bluetooth it does not seem to work with the p.c application unless the dongle is used with it.
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