Fitbit products (and probably similar products from other manufacturers) can sync with computers as well as with smart phones.
The question really is what computer and version of Windows do you have?
Assuming that you have a Windows 7 computer (because you asked your question in the Windows 7 section of the forum), you will need to buy a "dongle" (a USB-connected Bluetooth LE transceiver) and then download and install the appropriate "PC-Connect" software. Both of these things can be obtained from Fitbit.
https://www.fitbit.com/shop/accessories/wireless-sync-dongle
http://help.fitbit.com/articles/en_US/Help_article/1873 (scroll down to the section under "Fitbit Connect")
See also https://community.fitbit.com/t5/Windows-10-App/Windows-Compatibility-Guide/td-p/1564036 for a list of Fitbit products and what versions of Windows they work with.