Amazon.com: USB DC Power Charger Charging Cable Cord Works with JBL Synchros S400BT J56BT Headphone : Electronics
Amazon.com: 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 : Electronics
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Amazon.com: USB to 2.5MM Jack Cord Replacement USB Charging Power Supply Cable Compatible with JBL Synchros S300 S300I S300a S500 S700 S400BT J56BT E40BT E30 E40 E50BT S400BT Headphones (Black/60cm) : Electronics
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 Cable 2.5mm Adapter for JBL Synchros S700 S400BT E40BT E50BT J56BT | eBay
USB Charger Power Cable Cord Lead For JBL Synchros S400BT Bluetooth Headphone | eBay
Usb Charger Power Cable Cord For Jbl Synchros S400bt+ Bluetooth Headphone - Data Cables - AliExpress
Charging Power Supply Cable Cord Line for JBL Synchros S400BT S700 Headphones | eBay
JBL Synchros SB400BT Bluetooth Headphone Review - YouTube