Listen to your iPod or iPhone music & talk hands-free through your car stereo system. Tune Base FM connects through your FM radio receiver, with no special installation or wiring, so you get stereo sound for your playlist & your calls. Tune Base FM transmits your music & calls over the strongest FM frequency available. Clear Scan technology lets you find the clearest signal at the push of a button. Adjust your stereo to the station, & Tune Base FM does the rest. The easy-to-read display lets you see which station you're using. Make & receive calls with the push of a button. If your iPhone is playing music when a call comes in, the music automatically fades out. You'll hear the callers voice on speakerphone loud & clear through your cars stereo speaker.