The disclosure is directed to a mobile communication device that includes automatic gain control circuitry and operates in either a tracking mode or an acquisition mode. The incompressible fluid is in communication with the compressible fluid via the flexible diaphragm. In one aspect, an application store operation associated with one of the cards is detected. In addition, the mounting surface may have a step change in surface elevation for alignment of either of the at least one first element and the at least one second element. In some embodiments the thin film may comprise graphene.