Play your portable CD, MP3, or minidisc players through your car cassette system with very little sound degradation. It works with all portable players and cassette decks and requires no additional wiring or installation. Just connect your portable CD/MP3/MD player's stereo headphone jack to the 3.5mm plug and load the cassette tape into your vehicle's cassette deck stereo system. The mobile cassette adapter allows full stereo sound and easily connects your portable MP3/CD/MD/cassette player, PC computer, or laptop through your car's in-dash cassette deck. It provides an easy way to transfer quality sound from any portable audio source to your car stereo while on the road, beach, or anywhere you would use a portable tape player.