This is useful for cars, which often lack inputs for portable devices. Originally designed to connect portable CD players to car stereos that only had cassette players, the cassette tape adapter has become popular with portable media players even on cars that have CD players built in.
In the case of AM/FM systems without cassette playback, FM transmitters are recommended.
New generic Universal Car Audio Cassette Adapter, black
Now whether you are going down the block or cross-country, you will have plenty of music for the whole trip with this adapter.
Connect your CD Player / Mini Disk Player / Pod to your car stereo through your car's in-dash cassette player.
Cassette-shaped Interface inserts into your car's tape deck. Mini-plug inserts into your for
Pod / CD Player / Mini Disk Player headphone jack.
Silent mechanism reduces mechanical noise on the road.
Spring-loaded cassette head helps maintain contact with cassette player's head for clear sound.
40" cord so you can rest your Player / Pod where you want it.