I got one of the teensy new iPod shuffles for Christmas, plus
this FM broadcaster, which declared on the box "compatible with all iPods!" The box is slightly older than the newest iPods, however, and their website reveals what we discovered once we opened it, that it is not actually directly compatible with the new teensiest iPod.
Further examination proved that it
was compatible, it just didn't know it--a standard eighth-inch "mini" cable will go from the headphone jack of the iPod into the "Aux In" of the FM transmitter, and now it works just fine. The bonus is that my husband can plug his random cheap off-brand mp3 player into the transmitter in the same way, so now either player can be brought along in the car with us. I love it!