Hi....Most vehicle frameworks/recipients were really conceptualized in view of the iPod - the initial ones utilized the exceptional related till permit he to interface include the CD transformer input, press allow it to be completely controlled correspondingly through the headunit. Kenwood eventually was utilizing a HDD-based trade since the CD transformer, however when capacity got lesser pricey furthermore individuals don't need that thing hanging inches the storage divisions, we got USB ports for thumb drives. Along the spot when Android got well known some of them added USB have similarity, where the telephone goes about as aforementioned slave - basically it's simply a capacity gadget when associated, minus crippling the telephone capability and furthermore empowering calls to go through the sounds framework in the vehicle. Apple Home - Apple Developer