It pairs for a few seconds then quits - Digix BT-100 Portable Bluetooth Wireless Speaker with Microphone BT-100 PURPLE

when it is off hold down the power button for 8 seconds then pair device

Sounds like a slow data transfer issue, if that is the case the sound bar is most likely the problem.

clear any past stored passwords. reset unit and put into discovery mode. Usually holding the pair button for a few seconds puts the LED blue into fast flashing - discvery mode

same to all BT devices
first turn the Device ON and make sure it's ON searching for the Iphone to pair with.
secondly IPhone >> Go into settings >> bluetooth
and search for your device (uniden)
press on the device to pair with and enter the pass code if you were asked to do so
wait few seconds till the devices negotiate and setup the session and thats it Your Done !

You do not give a model number for your Wittnauer Montserrat. It does sound like it needs a reset - generally this is making an electrical connection for a few seconds between the positive terminal of the battery and a reset contact point on the watch movement - a pair of fine point tweezers is ideal for this.
HOWEVER - without knowledge of the movement used in this watch, this is just speculation.

No problem. When Jabra is off, press and hold till green light turns blue. On the iPhone: settings, general, bluetooth; switch to on. It will search, then it will list the Jabra BT8040, not paired. Highlight the "not paired" line, and it will start to pair; a few seconds later, it will say "connected".

Have you tried resetting the Blueant Z9i? You push the Volume Up, Volume Down and Blueant buttons all at the same time (with the device on). This will eliminate all paired phones, then re-pair with just your phone (hold down Blueant button for 6 seconds or so to enter pairing mode).

Hi, to pair this device first make sure it is powered off.
Then press and keep holding the power on button (large round one on the front). After a few seconds the LED will illuminate blue and then after a couple more seconds will flash red and blue. Now you should be able to pair with it.
Regards,
Nik.

I just had the same problem pairing the Jabra SP5050 with a Motorolla Razr but then realized the default setting on the Jabra is auto-pairing & that may not work with few phone that "discover" bluetooth devices. Solution: Turn off the Jabra SP5050 by pressing the answer button for about 5 seconds; then turn it ON by pressing it 7 seconds (contrast to the normal turn ON with fewer seconds - the bluetooth light should flash continuously) Now the speaker is in manual pairing mode; use the phone's normal discover bluetooth to locate it.

im having a problem with my h700c and my lg too it was paired with a samsung and i got the lg now the phone phone the BT fine it just wont pair,wat can it be?