Bathroom mirror wiring wrong?

[Jim]

I have a new bathroom mirror with lights which works ok but makes a constant buzzing noise whether it is turned on or off.

It wasn’t installed by me, but when I remove the front I was surprised to see that it has been wired using 2 electric wires - see attached photo.

As a complete novice I was wondering whether this was correct and perhaps this was the reason for the constant buzzing?

Would appreciate any help please.

 

[Dave OCD]

It takes a special talent to make two 1mm cables look as rough as that, some people just seem to have that knack.