What is the effect of the round dot next to the iPhone's rear camera?

 Are you using an iPhone and do you know what the effect of this round hole is? This strange detail on this iPhone is just Apple's decorative design or is there any other special use?

This round hole is present on all iPhone models and according to Apple it is called Secondary Microphone. This is the second mic, also known as the secondary mic of the iPhone, and has the effect of absorbing noise and filtering sound while the user makes calls.

Specifically, when the user receives or makes a phone call, the main mic located on the bottom edge will absorb the voice and transmit it. Meanwhile, this secondary mic will be responsible for removing noise, making the sound clearer.

On the iPhone, this secondary mic is located between the flash cluster and the camera. When observed, this detail is like a black dot

In addition, the circular mic also works to help the recording, audio or video recording process on iPhone better.

Normally, the secondary mic is located between the flash cluster and the camera of each iPhone. When observing this detail, it looks like a black circular dot decorated with the camera. So many iPhone users for many years but still do not know what its effect is.