Hydrophone

[Etna]

Hi skippers.
Times ago I remember to have seen a very glamour effect on the hydrophone.
On the upper right corner there is a light.
As I have seen so far is a unique feature : when a sound is intercepted that small bulb it enlights in green .
Am I wrong ? The problem is that I don't remember where I saw it :hmmm:
Anyone knows this ?
Hi
Etna

I saw it now in sh4.
Now...............is it possible to get it in sh3 ??