iPhone 4,All iPod models,iPhone,iPhone 3G,iPhone 3GS or any device that has a 3.5mm audio socket. 1. Plugs into ... the 3.5 mm headphone jack of any portable audio player 2. Play your music to any FM radio3 ... last frequency6. Supply power to FM Transmitter using included car charger 7. CE,FCC & RoHS approvel FM Transmitter for iPod,iPhone 4,iPhone 3GS & MP3 ...