BEST SOLUTION FOR PAIRING JABRA (OR OTHER BRAND) EARPHONES OR EARBUDS TO A FITNESS WATCH, MOBILE PHONE OR OTHER BLUETOOTH AWARE EQUIPMENT WHICH SUPPORTS AUDIO
I found (after much trial and error) that this is the best (and probably the only) way to "Pair" a Jabra Halo Smart v. 1.7.2 set of earbuds (the earbuds attached to on solid neck brace) to your
Fitbit watch (Ionic).
The procedure will probably also work (with slight variations) for any model of
Jabra Headphones/earbuds (or in fact any other brand of listening device) to any Fitbit (or other) watch which has the capability of Bluetooth connection. These instructions also apply for connections to any mobile phone or PC which has Bluetooth on board (nearly all mobile phones/PC's nowadays)
Please note that these instructions as written apply to setting up your Jabra on a Fitbit Ionic watch. The procedure should be roughly the same for whatever model bluetooth aware watch you may have and to whatever bluetooth earphones (produced by Jabra at least). Perhaps earphones produced by other manufacturers may also work (worth a try!)
The first thing to do is ensure the right side earbud headpiece is actually in your ear so you can hear what is going on! This is important! (Of course, it may be the "left" side for your own headphones/earbuds, just depending on which way your are wearing them! LOL 
Then:
1. Make sure your Jabra earbuds/headphones are turned OFF (No lights flashing)
If lights are flashing hold down the "on" button to turn off the headphones/earbuds.
(the lights will then stop).
2. Press and hold the centre ROUND button on the left hand side of the brace
(the side under your left ear). Again, this applies to the Jabro Halo Smart headpiece (brace).
With other models use the "On" button (may not be round).
3. Hold down this "on" button until your hear a voice coming through the earbud in your right ear
saying::
"Go ahead and connect me. Use the Bluetooth setting on your phone."
(Do not release the button until you hear those words).
4. If you are setting up for your watch, go to the watch (Instead of the phone) and "left swipe"
the screen until you see the "Settings" Icon (this is on an Ionic and so may be accessed differently
on other models)
5. Scroll down to "Bluetooth Connection Options" (again applies to Ionic) and Tap that menu item
with your finger. (Different wording may apply to other model watches)
6. Click on "+ Audio Device" (or other words indicating you are adding an audio device).
The watch will look around for a bluetooth signal from audio devices in the area..
It should find "Jabra Halo Smart v1.7.2" (or some other headset if you are using these
instructions to set up another model).
7. Tap on the item "Jabro Halo Smart 1.7.2" (or again, the applicable name of your device)
The message on the watch will then change to "Pairing Jabro Halo Smart" (or whatever)
8. A large "Tick" will then appear on your watch with the word "Paired" underneath it
(or some other form of confirmation).
9. You will hear a small "beep" in your earbud.indicating the connection has been made.
You can then repeat these steps for other devices such as desktops, laptops, tablets, mobile phones etc.
There......your done! 
This took ages to work out, but I think that perhaps nearly everyone makes the mistake I made.
I was not listening through the earbuds, and although I pressed the centre button until the light changed to blue (as per instructions) I was releasing the button straight away before the audible instruction through the earphone came through (see step 3).
(Of course I did not hear it since I did not have the buds in my ears!).
When the message with the instruction comes through on the earbud, then that is the moment the Headphones/Earbuds start emitting a signal for the Fitbit/Phone/computer to pick up and automatically "Pair".the two devices. If you release too early (even though the blue light is flashing) no connection can be made.
Hopefully these instructions will help all others to successfully pair their Bluetooth Earphones/Earbuds to their Fitbit watch (or to their bluetooth aware equipment) no matter what models they are using).
Enjoy! .
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