Amazon.com: LinkIdea Replacement Audio Cable with Mic Compatible with JBL E55BT E50BT E45BT E40BT E35 E30 E65BTNC 650BTNC S700, 2.5mm TRS to TRRS Aux Cord with Inline Microphone and Volume Control (5ft/1.5m) :
Amazon.com: Over Ear Headphone Case Compatible with Mpow H7, Kygo Life A9/600, Samsung Level On PRO; JBL Duet, Synchros E40BT, S400BT, E40BT, Synchros E50BT, Everest 700, Elite 700; ATH-M50x/50 : Everything Else
Amazon.com: Replacement E 40BT E40 Potein Leather and Soft Foam Earpads Cushion Earpads Compatible with JBL E40BT e40bt Headphones : Electronics
JBL Synchros E40BT (Black) On-ear Bluetooth® headphones at Crutchfield
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
JBL Synchros E40BT Reviews, Pros and Cons | TechSpot