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 :
Ancable USB to 2.5mm Male, Headphone Charger Cable for JBL Synchros E30 E40BT E45BT E50BT EB40 S400BT S400 S500 S700 J56BT Wireless Headphones Replacement Charging Cable
JBL E40BT High-Performance Wireless On-Ear Bluetooth Stereo Headphone - Walmart.com
Replacement USB Charging Cable for JBL Synchros E40BT/E50BT/J56BT Headphones 2.5mm – Ancable