Newly Discovered Flush Simulator Function.

I accidentially used a girls bathroom the other day (no really)..
I only realised my mistake when I looked at the armrest on the toliet.

Some ladies' toilets have a noise function to cover up any unfortunate noises.
This saves water as the user doesn't have to flush to get the same effect.

What noise does it make?

A toilet flushing, of course.