Boss FM-MOD FM Modulator Allows The User To Play Audio From An Aux Source, Such As A Dvd Player, Through The Existing Mobile Audio System Using A Selected Frequency On The Fm Tuner Section Of The Head Unit Allows The User To Play Audio From An Aux Source, Such As A Dvd Player, Through The Existing Mobile Audio System Using A Selected Frequency On The Fm Tuner Section Of The Head Unit Allows The User To Play Audio From An Aux Source, Such As A Dvd Player, Through The Existing Mobile Audio System Using A Selected Frequency On The Fm Tuner Section Of The Head Unit FM modulator