Review on OKCSC BT3S Wireless Bluetooth Headphone Cable 0.75mm 2pin - Bluetooth 5.0, Apt-x & AAC Support, 20 Hours Playback - Compatible with KZ AS10, ZST; TRN v80, X6, IM2 (0.75mm Jack) by Amber Hickman

The first unit I received was defective. Won't turn on, won't charge. It was easy to call Revain and request a replacement with no shipping cost. The second block works fine. I ordered the 2-pin 0.78mm version to convert my wired KZ headphones to wireless. The 2-pin connectors snap firmly into the headphones after the included cable is removed. The sound quality is very good and the wireless range is the same as my other Bluetooth wireless devices. I've only used this device a little so far so I can't give a long-term reliability report, but the device looks well made.