Amazon.comThe Sony CPA-9C cassette adaptor allows you to connect your minidisc or CD player to a vehicle cassette player. While this Sony product works best with Sony CD and MD players, the adaptor will operate with non-Sony products as well. There are a couple of key features to this adaptor which make it a fine choice. The first notable feature is the spring-loaded head. The head will automatically adjust itself to your vehicle's cassette deck, ensuring that the two heads have optimum contact and transfer the best possible sound. The second key feature is the silent mechanism. A silent mechanism yields less operational noise and a better quality MD or CD sound. This adaptor works with all cassette players which require you to insert the tape opening facing the side. The mini-plug inserts into a portable CD or MD headphone jack. The cassette adaptor is a cheap way to make your vehicle CD and MD operational.What's in the BoxSony CPA-9C Cassette AdaptorProduct DescriptionConnect your Portable CD Player to your car stereo with the help of this Sony Car Cassette Adaptor!From the ManufacturerSony's CPA-9C MiniDisc/Discman Cassette Adapter is ideal for use with Sony MiniDisc and Discman CD players. Permitting connection from your portable MD or CD player to your car stereo, the CPA-9C features a silent mechanism, and a self-adjusting spring-loaded head.Features: Connects a Portable CD Player to a car stereo, through the car's in-dash cassette player For use with Sony Discman players and non-Sony players Self-adjusting spring head Cassette-Shaped Interface inserts into a car's tape deck (compatible with decks that make you insert the cassette with the tape opening facing the side) Mini-Plug inserts into a portable CD player's headphone jack Silent Mechanism reduces mechanical noise on the road Self-Adjusting Spring-Loaded Head maintains optimum contact with your cassette deck's tape head Frequency Response: 50 -- 20,000Hz (depending on cassette deck) Cord Length: 4 feet, 11 inches (1.5 m)