iPhone 4,All iPod models,iPhone,iPhone 3G,iPhone 3GS or any ... the 3.5 mm headphone jack of any portable audio player 2. Play your music to any FM radio3. Backlit display ... is easy to read 4. Frequency range: 87.9MHz ~ 107.9MHz,0.1MHz/step5. Memorizes ... 7. CE,FCC & RoHS approvel FM Transmitter for iPod,iPhone 4,iPhone 3GS & MP3 Player