The Sandberg Bluetooth Audio Links 2-in-1 TxRx allows you to send and receive an audio signal wirelessly via Bluetooth. Configured as a sender (Tx), you can receive sound from the headphone output, for example, on a TV connected to a Bluetooth headset. Configured as a receiver (Rx), you can connect a Bluetooth device such as a mobile phone via, for example, the AUX port of your car stereo to enjoy wireless music from your mobile phone through your car's sound system.