2-in-1 Transmitter & Receiver: Converts wired devices (via AUX/RCA) to Bluetooth-enabled for music, movies, or headphones. Bluetooth 5.4: Stronger connection, up to 33ft range, stable audio with no dropouts. Hands-Free Calling: Built-in mic with noise cancellation, supports calls and voice navigation. USB Powered & Easy Use: Plug and play via USB, quick mode switch (TX/RX), and one-button control for calls and music.