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Description: Note: when you first insert ZF-169 Plus, the light is Red, it is in TX (Transmitter)Mode, which will not switch to RX Mode automatically. It needs you to unplug the ZF-169 and then insert again, the light will become Blue, and it is in RX(Receiver) Mode now. Sometimes when you in the same mode for long time, you need to repeat unplug and insert twice and it will change to the other mode Package Content 1x Bluetooth 5.0 Transmitter/Receiver Adapter 2x 3.5mm Aux Cable 1x User Manual If the device can not work normal, please contact with us first, We will try our best to help you solve all problems,Please trust us,Thanks in advance.