Most modern Hisense TVs have bluetooth on board. However, if you have an older TV, it may not be there. To check this you can go to Settings or visit the Hisense website and check the TV specifications.
A factory reset is a way to restore your Hisense TV to its original settings. This can be useful if you are experiencing problems with your TV, or if you want to sell your TV and want to erase all of your personal data.