Use this unit to listen to your Zune or any other MP3 player through your car FM stereo receiver. . This wireless FM transmitter wirelessly transmits music to FM channel . Just plug the FM Transmitter into the Zune dock connector and select one of the available frequencies. . The unit comes with an optional connector for all other MP3 players. . Available frequency settings : 88.1MHz, 88.3MHz, 88.5MHz, 88.7MHz