A mobile device that displays a list of traveling maneuvers or driving directions according to a route from a start location to a destination location is provided. An isolation layer is disposed between the upper deck, and one or more contacts are formed between the upper deck and the lower deck to couple one or more of the contact lines of the upper deck with one or more contact lines of the lower deck. The second LED board is adjustably fixable in lengthwise overlapping relationship to the first LED board to provide a length adjustable extension thereto and substantially continuously maintain an optical system output over a combined length of the first LED board and the second LED board.