An interchangeable hearing aid control panel with at least one activation zone arranged in connection with a layered structure. Also disclosed are compositions containing the compounds of Formula 1 and methods for controlling an invertebrate pest comprising contacting the invertebrate pest or its environment with a biologically effective amount of a compound or a composition of the invention. Alternatively, multiple cipher operations can be performed in parallel enabling a receiver to determine which cipher algorithm was employed in encrypting a data packet. The corrective member is further inserted into the patient and subsequently operatively attached to a second vertebral member that applies a second corrective force to correct a second vertebral member alignment. The negative pressure is preferably imposed through a plurality of ports which may be disposed in a substantially planar surface of the instrument which contacts the cardiac tissue. The method also includes receiving a message from the medical device, and in response to receiving the message, indicating to the medical device that information intended for the medical device resides on the server.