Car audio cassette adaptor may transfer the digital audio signal of MP3, CD, VCD, DVD, GAME BOY, and PDA to the sound equipment in car, so you can enjoy Hi-Fi digital audio signal by the tape player in car. Car audio cassette adaptor need not change any structure of car and need not add any the external power in car, it can be used different kinds of vehicle tape player. The adaptor has ?play-and play? feature, it like a tape and need to insert the car audio cassette player, so you can enjoy Hi-Fi digital audio signal.