RDS iPod radio transmitter (1/3) - A radio transmitter plays music stored on a music device over radio signals. Kensington developed the first transmitter in the market to use RDS (Radio Data System, which sends data along with conventional FM radio signals) to display song and artist names on RDS equipped car stereos. As Kensington's highest priced, top-of-the-line FM transmitter, this required a compelling design on par with its price and performance.