Receiver mode(RX)Blue light, upgrade from non-Bluetooth devices to Bluetooth devices. The non-Bluetooth device connects to the Bluetooth adapter via an audio cable (the non-Bluetooth headset connects directly), then the adapter is connected via a Bluetooth tablet or cellphone, the final transformation has been successful.
Transmitter mode(TX)Red light, connect the audio cable to the output connector of a non-Bluetooth device, then connect the Bluetooth adapter to the Bluetooth device so that the Bluetooth device can hear music. Wirelessly stream audio from a Bluetooth-enabled TV, home stereo, or CD player to headphones or Bluetooth speakers.