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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
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JBL TUNE 510BT – Auriculares inalámbricos on-ear con tecnología Bluetooth, ligeros, cómodos y plegables, hasta 40h de batería, Siri y Asistente de Google, con conexión multipunto, blanco : Jbl: Amazon.es: Electrónica
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