FM modulators are a great solution to enjoying a DVD played through the cars audio systems. Simply give EFM-02 power, connect the audio outputs from a DVD player, gaming console, or other entertainment device to the audio inputs, and the factory AM/FM antenna leads to the antenna input/output. EFM-02 injects the audio signal from the entertainment device into one of 3 selectable channels; 88.7-89.1mHz. Be sure to select a channel not being used by a local radio station.