Amazon.com: SCOVEE USB to 2.5mm Male AUX Audio Jack Charging Cable for JBL Synchros S300 S300I S300a S400BT J56BT E40BT E30 E40 E50BT S500 S700 Headphones Stereo Power Wire for JBL Charger
Replacement USB Charging Cable for JBL Synchros E40BT/E50BT/J56BT Headphones 2.5mm – Ancable
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USB to 2.5mm Male, Headphone Charger Cable for JBL Synchros E30 E40BT E45BT E50BT EB40 S400BT S400 S500 S700 - Walmart.com
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Amazon.com: USB Charger Cord Charging Cable Lead for JBL Synchros E50BT Bluetooth Headphone : Electronics
2.5mm Usb Charging Charger Cable For Jbl Synchros E40bt/e50bt/j56bt Headphones Usb Charge - Data Cables - AliExpress