Fitbit One - Manual (Page 11)

7
Wireless sync to a computer
Fitbit Connect must be installed and your Wireless sync dongle plugged into your
computer for your tracker to sync to Fitbit.com.
Syncing occurs every 15 minutes when your tracker has new data and is within 15 feet
of a plugged-in Wireless sync dongle.
You can force sync your tracker by clicking the Fitbit Connect icon , which is located
by the time and date on your computer, then selecting Sync Now .
Note: If you experience any trouble syncing your tracker with your computer, you
can visit http://help.fitbit.com for help.