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USB to 2.5mm Male, Ancable Headphone Charger Cable for JBL Synchros E30 E40BT E45BT E50BT EB40 S400BT S400 S500 S700 J56BT Wireless Headphones Replacement Charging Cable : Electronics
VEKEFF Replacement Ear Pads Cushions for JBL Synchros 400BT S400 E40BT E40 BT Bluetooth Wireless On-Ear Headphones (E40BT) : Electronics
JBL Synchros S400BT Review | SoundVisionReview
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 :