What is the hole on the left side of the lightning port on AirPods Pro 2 charging case?

[MrLoL]

I can't find anything on this mysterious hole on the bottom of the new charging case.

It's certainly not a speaker, as far as I know Apple does not present this hole as something making sound on the promo shots & website (why would there be another speaker on the left with a single hole?) but if anyone found something with the reviews by any chance I'd gladly appreciate it.

The only information I recall is the rumors specifying this is a microphone for the Live Listen?

 

[MrLoL]

Update: found that out via Danny's review at 1:26 that this is actually a vent hole for the speaker! Interesting indeed!

 

[rashidmahmood]

I can't find anything on this mysterious hole on the bottom of the new charging case.

It's certainly not a speaker, as far as I know Apple does not present this hole as something making sound on the promo shots & website (why would there be another speaker on the left with a single hole?) but if anyone found something with the reviews by any chance I'd gladly appreciate it.

The only information I recall is the rumors specifying this is a microphone for the Live Listen?

Hi, I did some R&D and found that that this opening is to balance air pressure of the case.
here the link