It used connect your cellphone or music equipment to car cassette play music while your car is old without CD and bluetooth. How to ... your MP3,MP4,DVD,MD,VCD,PDA, etc to your car cassette player and play your hand-held equipment music, so you can ... -held products like cellphone , just put iCassette in your car cassette holder, your car will play your celphone music. So simple to use ...