This is a great idea for those who live in the country... but for those of us who live in the city, it just doesn't work.The FM transmitter required an unused radio frequency in order to transmit it's signal. Otherwise, if you try to use a frequency that is alreay in use by a radio station, the signals will conflict.Driving around in a large metropolitin area, where there are hundreds of radio stations, I could never keep a clear signal.