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Amazon.com: Replacement Charging Power Supply Cable Cord Line for JBL Synchros E40BT E50BT J56BT S400BT S700 Headphones (Black) : Electronics
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USB to 2.5mm Headphone Charger Cable for JBL Synchros E30 E40BT E45BT | eBay
Amazon.com: Audio Cable Replacement with in-Line Mic Remote Volume Control - Compatible with JBL Synchros S300 S300I S300a S500 S700 S400BT J56BT E40BT E30 E40 E50BT S400BT Headphone and Samsung Galaxy Android :
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JBL Synchros E40BT Repair - iFixit
User manual JBL E40BT (English - 22 pages)
Replacement USB Charging Cable for JBL Synchros E40BT/E50BT/J56BT Headphones 2.5mm – Ancable
1.2m 2.5mm To Usb Charging Cable For Jbl Bluetooth E40bt/e50bt/j56bt Headphones Usb Charge - Audio & Video Cables - AliExpress