![I bought JBL headphones and found out they have these holes on both sides. What are they for? They're empty and kinda deep, the headphones aren't wireless so I guess it's not I bought JBL headphones and found out they have these holes on both sides. What are they for? They're empty and kinda deep, the headphones aren't wireless so I guess it's not](https://i.redd.it/zkm9dihmx0b51.jpg)
I bought JBL headphones and found out they have these holes on both sides. What are they for? They're empty and kinda deep, the headphones aren't wireless so I guess it's not
![Amazon.com: JBL Tune 660NC: Wireless On-Ear Headphones with Active Noise Cancellation - Black : Everything Else Amazon.com: JBL Tune 660NC: Wireless On-Ear Headphones with Active Noise Cancellation - Black : Everything Else](https://m.media-amazon.com/images/I/419o+6Up+EL.jpg)
Amazon.com: JBL Tune 660NC: Wireless On-Ear Headphones with Active Noise Cancellation - Black : Everything Else
![Amazon.com: JBL Tune 710BT Wireless Over-Ear Bluetooth Headphones with Microphone, 50H Battery, Hands-Free Calls, Portable (Blue), Medium Amazon.com: JBL Tune 710BT Wireless Over-Ear Bluetooth Headphones with Microphone, 50H Battery, Hands-Free Calls, Portable (Blue), Medium](https://m.media-amazon.com/images/I/61WaMevsRHS.jpg)