I don't believe that your Binatone has any kind of problem, I think it needs some small configuration ...
If you tried with Windows XP, Windows Vista and Windows 7 and WMDC did not work it makes no sense to try to work with Windows 10.
Your operating systems may not have the appropriate driver.
one last tip to try to help you with the synchronization problem, is to install NPlus to try to solve the connection problem:
Spoiler: NPlus
Your model (U435) belongs to the binatone series U435 / U505 / U605, this can help you find information about synchronization problems.
Try NPlus, I have no other idea for the synchronization problem.
Here is information on how it was done on the U605, in this case there were no connection problems:
[Only registered and activated users can see links. ]
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