This transmitter is easy to use: after plugging in the transmitter to your music player, set the FM frequency (88.1MHz - 107.9MHz) on the transmitter to match your radio's frequency. You'll soon be enjoying your favorite music in high-quality stereo sound. This IP-FM Portable FM Transmitter works with all iPod models, as well as iPhones and other MP3 players. This transmitter offers up to 45 days of standby time and requires two AA batteries. Enjoy your favorite music virtually anywhere with this high quality wireless FM transmitter.