play music without AUX port?

[DROID_DOES_5150]

my car radio doesnt have a AUX port. and i would like to listen to music through the car speakers from my phone. I heard theres a little device that i could plug into my droid and turn to a certain station on my car radio and have the music be played from there. whats this called?

 

[rjmaype]

Motorola DROID FM Transmitter / Internet Music Vehicle Adapter with integrated Car Charger - w/ Goma - FMTI-2976