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Amazon.com: USB to 2.5mm,Ancable Replacement USB Charging Cable (3ft / 1m) for JBL E40BT E50BT J56BT Headphones (Black) : Electronics
USB Charger Cable 2.5mm Adapter for JBL Synchros S700 S400BT E40BT E50BT J56BT | eBay
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
Product Review: JBL Synchros E40BT Bluetooth Headphones - GeekMom