Bluetooth 5.0 Wireless Handsfree Stereo Adapter A2DP Receiver For JBL Synchros S300 S500 E30 E35 Headphones - AliExpress
JBL Synchros S300 Premium On-Ear Headphones for iOS with built-in remote/Microphone - White/Red - Newegg.com
JBL Synchros S300 vs JBL Synchros S400BT: What is the difference?
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