Will charge 3 connect to Extreme

As your Fitbit watch has bluetooth capabilities, this should not be an issue. If you follow these steps you should be able to pair the two:

• After ensuring your speaker is properly charged, activate the pairing mode on your bluetooth speaker by powering on the device, and pressing the bluetooth icon button. (A blue light will start flashing and you should hear an audible noise indicating your speaker has gone into pairing mode).
• While your speaker is waiting to pair, enter the app settings on your watch and select bluetooth and then + audio device
• Your watch will return a list of available devices, so just be sure to select your bluetooth speaker. I would recommend being close, but you don't necessarily need to be right on the device unless one or the other may be experiencing signal issues.
• When the pairing is complete a checkmark should appear. Be sure the volume isn't set too loud unless you're entering beast mode :P.

Note Should this not work please power off both devices, and start the procedure again. I hope this helps and if not please return and we will assist further to get you all set!