Allows you to play your iPod® through any FM radio. Lock in up to ten of your favorite stations with memory button. No batteries or software required. Car Charging Dock with Digital FM Transmitter allows you to charge your iPod® while broadcasting songs through your car’s FM stereo. P-4A, P-5, P-5A, P-13, P-25 are compatible with nano, mini, 3G, 4G, photo and 5G video. P-4 is compatible with mini, 3G, 4G and photo.