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2pcs USB CHARGING Charger Cable For JBL Synchros E40BT E50BT Headphones | eBay
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User manual JBL E50BT (English - 22 pages)
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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JBL Synchros E50BT Bluetooth Headphone Review - Normal Consumer
Synchros E50BT | Bluetooth®, around-ear wireless headphones with ShareMe™ music