Amazon.com: Headphone Charger Cable, Ancable 6ft USB to 2.5mm Stereo Jack Male Charging Cable for JBL Synchros E30 E40BT E45BT E50BT EB40 S400BT S400 S500 S700 J56BT Bluetooth Headphones 2.5mm Male Cable :
Jbl Synchros E40bt/e50bt/j56bt Headphones Usb Charge & Audio Cable Replacement - Data Cables - AliExpress
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USB Charger Power Cable Cord For JBL Synchros E40BT E50BT J56BT S400BT Headphone | eBay