JBL SYNCHROS E40BT Wireless Headphones于 2014 年 9 月 19 日首次发布。优雅的黑色设计和 205.00 克的重量使JBL SYNCHROS E40BT Wireless Headphones成为一款美观舒适的耳机。此版本的 JBL 耳机支持蓝牙 3。
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