Hi....Most vehicle frameworks/recipients were really conceptualized in view of the iPod - the initial ones utilized an exceptional link to permit it to interface with the CD transformer input, and permitted it to be completely controlled correspondingly through the headunit. Kenwood eventually was utilizing a HDD-based trade for the CD transformer, however when capacity got less expensive and individuals don't need that thing hanging in the storage compartment, we got USB ports for thumb drives. At the point when Android got well known some of them added USB have similarity, where the telephone goes about as the slave - basically it's simply a capacity gadget when connected, without crippling the telephone capacities and furthermore empowering calls to go through the sound framework in the vehicle.