Scosche tuneFREQ RDS is a wireless FM transmitter for iPod and iPhone that allows you to play your music through your car's FM radio. It has a range of 88.1 to 107.9 FM and can be used with both US and UK frequencies. It also has an RDS transmitter that can send song data to compatible radios, displaying artist, song, and track number. The FMRDS can charge your iPhone while in use when connected to a powered mini-USB charging cable (sold separately).