What is this part (webcam) for?

I have a notebook with which I would like to cover the camera
(ASUS UX360U)

at the top are 3 "circles". The one on the left is an LED that indicates when the webcam is in use and the one in the middle is the camera.

But what is the big, right one for?

It shouldn't be the microphone, it's downstairs. And the speakers are also under the notebook… I have already tried whether it is some kind of flash / lighting, but I don't know how to trigger it…

If anyone knows what it is, I would be happy to find out!

Most likely, one of them is an ambient light sensor that detects the brightness of the environment and darkens or brightens the screen accordingly.

Think more on the right that is the camera and in the middle the sensor.

Hmm, so the one in the middle is definitely the camera, I tried that. And the screen brightness is regulated manually (at least I don't know where I could set an automatic)