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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
JBL Live 500BT Wireless Review - RTINGS.com
JBL LIVE 500BT | Your Sound, Unplugged
JBL Tune 500BT by Harman Powerful Bass Wireless On-Ear Headphones with Mic, 16 Hours Playtime & Multi Connect Connectivity (Black) : Amazon.in: Garden & Outdoors