Portable Audio Cassette Player Is There A Device For Your Car's Radio?

Is there a device for your car's radio? - portable audio cassette player

Is there something that can be connected to an electronic device, so that the audio is played thought the car speakers? Think of the band, which connects to a portable CD player. After audio has been fueled by the type of audio and speakers. However, since CD players in cars. What type of device do you have?

I do not want to change on the car than for direct connection to the speaker.