After using the earphones for so long, what are the two small holes on the earphones used for?

Every phone maker is giving away a pair of homemade headphones with every purchase. I have to say, only their standard headphones are durable. As far as the sound quality of the earphones is concerned, Apple's original earphones are undoubtedly indispensable.

The earphones are Apple's own original earphones, released in 2012. One of the most popular headphones for Apple users today. What sets it apart from the boss headphones is its shape and how it feels to wear it! The drive module of this headset, after three years of unremitting efforts by Apple engineers, can minimize sound loss and improve sound quality while reducing power consumption. And the wearing comfort of this headset is greatly improved! Best of all, this headphone is the world's leading waterproof headphone. This earphone can avoid the effect of sweat produced on the earphones during exercise.