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
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USB to 2.5mm Headphone Charger Cable for JBL Synchros E50BT EB40 S400BT | eBay
2.5mm USB CHARGING Power CABLE For JBL Synchros E40BT/E50BT Headphones J56BT 2ft | eBay