2-IN-1 BLUETOOTH TRANSMITTER RECEIVER In TX mode, plug the Bluetooth transmitter into non-Bluetooth devices such as TV/PC/MP3/Airplane to transmit the audio to the Bluetooth headphone/speaker/sound bar; In RX mode, plug the Bluetooth receiver into wired speaker/headphone/car stereo and receive audio from cell phone/tablet/computer via Bluetooth. Please note that the RCA cable needs to be plugged into the audio out jack, not audio in. Easy TO USE & STABLE CONNECTIONEquipped with the latest version of the Bluetooth chip and upgraded software, this Bluetooth adapter can turn your old non-Bluetooth device into a wireless one. One key to power on and enter pairing mode. Easy to switch between transmitter (TX) and receiver (RX) modes. HIGH FIDELITY STEREOThis Bluetooth transmitter receiver can be connected with Bluetooth speakers or headphones that support HFP/A2DP/AVRCP protocol to form a wireless audio transmission network, allowing you to enjoy high-definition sound that