It isn't

All of our mirrors come with only one light setting.

our mirrors are 12v

It would need to be taken off the wall, flipped over and replace with the new batteries.

Yes, this can be hung on a plasterboard wall, but you would need wall plugs that are specifically designed for plasterboard

This comes from the base, but we wouldn't recommend trimming this.

Over 100 hours of continuous use, the lifetime is also dependant on the MaH rating of the batteries.