An article includes a substrate, a functional coating deposited over at least a portion of the substrate, and a protective coating deposited over at least a portion of the functional coating. The system also shields the point from extraneous radiation that would not be concentrated at the point. The keyboard includes a platform supporting the plurality of keys. Also, if a movement is sensed by a vibration sensor when a user grips a gun or aims at a target, the power saving mode is released and thus power saving functions are achieved without any inconvenience. A configuration time period is activated in response to authentication of the credentials.