The listing, iTrip FM Wireless Transmitter for your Car has ended.
Play your iPod, iPhone, smartphone or digital music player through your car stereo with iTrip!
Just plug iTrip into your car's dock connector, press the SmartScan button, and you're set. SmartScan finds the cleanest frequency to play your music through your car or home stereo speakers without hassles or wires. And
use iTrip's three user-programmable presets to remember your favorite frequencies and recall them instantly.
This was used for about 6 months and works perfectly; I bought a new car that has an aux outlet so I no longer need this for playing my MP3s. New, it retailed for about $55.