FMTransmitterforiPod,iPhone3GS MP3Player Productfeatures: 1.Plugsintothe3.5mmheadphonejackofanyportableaudioplayer 2.PlayyourmusictoanyFMradio 3.Backlitdisplayiseasytoread 4.Frequencyrange:87.9MHz~107.9MHz,0.1MHz/step 5.Memorizesthelastfrequency 6.SupplypowertoFMTransmitterusingincludedcarcharger 7.CE,FCC RoHSapprovel Compatiblewith: AlliPodmodels,iPhone,iPhone3G,iPhone3GSoranydevicethat hasa3.5mmaudiosocket.