The Roadmaster VRFM9 FM modulator lets you listen to music form your mobile device through an FM station on your car radio. The unit is powered through your car’s cigarette lighter, and tunes into an unused FM station to receive sound files from your handheld device. Although it performs a complex task, the VRFM9 is easy to install. You can perform all the music playback functions such as rewind, fast forward, and volume control on your handheld. However, the reviewer suggests that you only raise the volume halfway on your handheld device and just control the volume, bass, and treble through your car audio system. Doing otherwise can have a negative effect on audio quality. Although the VRFM9 occupies the cigarette lighter slot, you can still charge or power up your mobile device in your car by purchasing an optional adapter that splits your cigarette lighter outlet into 2. This model also has SD card and USB slots, allowing you to listen to music directly from an SD card or a USB flash drive. The LCD readout and the buttons on this unit are small, so you have to stop for a red light to change any settings.