For i Phone 4G FM Transmitter 1.Memorizes up to 4 frequencies,work for all iPod,iPhone ... is match to Nano 5G FM Transmitter for iPhone 4G Features:1. High fidelity,Stereo,digital PLL2 ... to 4 frequencies5. Draws power from iPhone or iPod,no batteries required6. With charging ... for all iPod models(Incl.iPod nano 3rd & 4th generationiPod touch 1st & 2nd generation,iPod classic),iPhone & iPhone 3G & iPhone ...