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Amazon.com: Compatible Repair Parts Leather EarPads for JBL Synchros S400 BT Bluetooth Wireless and Synchros S300i Headset : Electronics
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POYATU Bluetooth Adapter Receiver For JBL E30 E40 Synchros S300 S300I S300a S500 S700 Headphones Wireless Bluetooth Transmitter|Wireless Adapter| - AliExpress
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New JBL® Synchros S400 Bluetooth Headphones Marry High Resolution Sound with an Intuitive User Experience | HARMAN
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