This transmitter would allow me to listen to music in MP3 in my car (Peugeot 406), the CD player does not read MP3 format. But living in the Paris region, it is impossible to find a stable and regular free frequency to associate the transmitter to the receiver. The sound is full of received interference. So, in my opinion, this unit is not near large cities, where FM radio stations are too numerous. For those who live in less crowded areas by issuers, the only solution is to give it a try. I think it is better, when possible, move to a different type of products to play MP3.