... you struggling for change your radio to a DVD? One hand you want the navigation, need the Bluetooth, ... like a old lady.Ok, if, you have met one of these circumstances, you MUST try our new product ... Sound, you can only get one of them.But now, if you do one more action after you install the DVD ... to let the music come out at the exactly same time. 3). Increasing Sound Resolution: every music element, even ...