recently bought Tune 520BT. can someone tell me what these are for? : r/JBL

JBL Tune 520BT Ear Headphone Wireless, Lightweight, Foldable, Black

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JBL Tune 510BT On Ear Wireless Bluetooth Headphone Bundle with gSport Case (Black)

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The JBL Tune 520BT headphones stream powerful JBL Pure Bass sound thanks to the latest 5.3 BT technology. Easy to use, these headphones provide up to 57 hours of pure pleasure and an extra 3 hours of battery with just 5 minutes of charge. Download the free JBL Headphones App and customize your sound through the EQ, while Voice Prompts guide you through the headphones features. Manage calls, sound and volume from the earcup, thanks to the convenient button control.