Transmitter mode (TX): Wirelessly transfer audio from a non-Bluetooth TV, home stereo or CD player to a Bluetooth headset or speaker.
PC audio transmission mode (TX): Wirelessly transfer audio from a PC, laptop to a Bluetooth headset or speaker via a USB port, no audio cable required.
Receiver mode (RX): Stream audio wirelessly from a wired stereo, speaker or headset via a Bluetooth-enabled phone, tablet or computer.
USB receiver mode (RX): Plug the Bluetooth receiver into the USB jack of an audio device with a USB audio protocol.
Turn on the audio device and the receiver's blue LED will flash. Turn on Bluetooth in your phone, search for ID: MSD-168, and if pairing is successful, it can transfer music to audio devices and play music through this USB Bluetooth receiver.