My recommendation, seriously, is to -- if you have a cassette player in your car -- go with TheInvsbleMan's opinion, or if you don't, then invest a few bucks in a car stereo that has RCA inputs (or even an iPod dock). You can usually find some good ones on sale at Best Buy for maybe thirty or forty bucks more than you'd pay for a transmitter. Worth it, if you ask me, as you won't get the unpredictable transmission quality.