Listen to and share your portable audio player tunes while you?re driving by using the Monster Radio Play, Car Stereo Wireless FM Transmitter. Just plug the RadioPlay into your car?s 12v cigarette lighter and the mini headphone jack on almost any portable audio or DVD player. Then select a station on RadioPlay using the one-touch FM channel selector. Find the same station on your car stereo, turn on your favorite song and you?re ready to roll. Your music transmits wirelessly to your car stereo using one of eight FM radio frequencies.