No refitment to car.Put one connector of the tranimitter into the car lighter plug and the other connector into the earphone hole of MP3(CD, MD, etc.).Then set the car radio requency to FM109.7 or according to your requirement(?.5MHz).The music inside MP3(CD, MD, etc.) can be changed to frequency signal Automatically and sent to the car audio system.That Means to use the transmitter, you can listen to the Music inside MP3(CD, MD, etc.) from car audio system.
Transmitter For Car Audio System (Car 1020) product, offered by
Zhejiang Mingri International Trade Corporation