![Amazon.com: USB to 2.5mm,Ancable Replacement USB Charging Cable (3ft / 1m) for JBL E40BT E50BT J56BT Headphones (Black) : Electronics Amazon.com: USB to 2.5mm,Ancable Replacement USB Charging Cable (3ft / 1m) for JBL E40BT E50BT J56BT Headphones (Black) : Electronics](https://m.media-amazon.com/images/I/61YhqzePkwL.jpg)
Amazon.com: USB to 2.5mm,Ancable Replacement USB Charging Cable (3ft / 1m) for JBL E40BT E50BT J56BT Headphones (Black) : Electronics
![Amazon.com: USB Fast Charger Power Adapter Cable Charging Cord Compatible with JBL Wireless Bluetooth Speaker Earphone Headphone : Electronics Amazon.com: USB Fast Charger Power Adapter Cable Charging Cord Compatible with JBL Wireless Bluetooth Speaker Earphone Headphone : Electronics](https://m.media-amazon.com/images/I/61N2ij72O5L.jpg)
Amazon.com: USB Fast Charger Power Adapter Cable Charging Cord Compatible with JBL Wireless Bluetooth Speaker Earphone Headphone : Electronics
![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://preview.redd.it/zkm9dihmx0b51.jpg?auto=webp&s=5a648f35d0bca46bee5fc831ffed44638080c89c)