Mode:
TX - Transmitter Mode
Wireless transfer audio from your non-Bluetooth media devices (such as TV, CD/DVD player, Projector) to your Bluetooth headphones or Bluetooth speakers via audio cable.
PC Audio Transmitter Mode
Wireless transfer audio from your PC to Bluetooth headset or Bluetooth speaker through USB port, no audio cable is required.
RX - Receiver Mode
Wireless transfer audio from your Bluetooth-enabled phone to your non-Bluetooth headphone/speakers/car stereo system via audio cable.

Wide compatibility
It is suitable for non-Bluetooth computers, and also for non-Bluetooth devices with 3.5mm audio hole.

Note:
*Only one device can be connected at a time.
*No built-in microphone to support phone calls.
*3.5mm audio cable is used to transfer audio.
*In addition to power supply, USB can also transmit audio when directly plugged into the computer, which will be recognized as a speaker. If you do not use the audio cable, you can find Zf-169p in the playback device on your computer, but the Bluetooth logo is not displayed.
*When used on PC, if the prompt 'Unable to identify the device' is displayed, this means that the USB interface is not inserted properly.
*The volume can only be adjusted through the music player, not the computer system. When using 3.5mm audio cable to connect PC(projector, CD player, etc.), you can adjust the system volume.
*When pairing with Bluetooth headphones, turn off nearby smartphone Bluetooth to avoid affecting the pairing.

Specification:
Bluetooth Version: 5.0+EDR
Material: ABS
Bluetooth Format: HFP/HSP/A2DP/AVRCP
Input Interface: Micro USB
Input: 5V/1A
Product Size: 1.5*1*0.5inches

Package:
1x USB Bluetooth Transmitter Receiver
2x 3.5mm Audio Cable(1.6ft/50cm)
1x User Manual