A method of notifying an operation state change of a device is provided. Composite coatings and coated articles made therefrom, the coatings comprising mono or multi layers having a textured outer surface morphology, the layers may be continuous andor discontinuous and may comprise different particle phases. It is characterized by a large surface suitable for the colonization of bacteria and also by a density which allows the composite material to be suspended in the medium present in the sewage treatment plant. The end-user can utilize the medical monitoring appliance to capture health data concerning the end-user. When the antireflection layer is formed on a hard coat layer having an uneven surface roughened by particles, the antireflection film is excellent in antiglareness. An electrical switch may cut off supply fluid, fuel supply, andor activate an alarm.