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
USB Charger Power Cable Cord For JBL Synchros E40BT E50BT J56BT S400BT Headphone | eBay
2 Meter USB - 2.5mm charging Cable for JBL Synchros E40BT/E50BT Headphone J56BT | eBay
Amazon.com: Sqrmekoko Replacement Charging Power Supply Cable Cord Line for JBL Synchros E40BT E50BT J56BT S400BT S700 and AKG K490NC K495NC N60NC Headphones (6inch) : Electronics