Why there is a MIC in Xiaomi Aqara Gateway?

I had some problem with my Xiaomi Gateway (the Aqara version, I think it’s the 3rd version):
during the night I could hear distinctly the noise of the electrical curren flowing in the gateway.
So today I decided to open the gateway to check where could be the problem.
But as I opened the gateway I found that inside there is a microphone.
Really why a MIC? what’s the use?
I didn’t found mention on the third part store where i bought this gateway that it has a MIC!!

I have also two Xiaomi Gateways 2nd edition that I use with HomeAssistant. Do you know if also that version has a MIC inside? Thanks

Here is the explosion scheme of the gateway:
57

and there is some photos of the gateway:


1 Like