An apparatus comprising an insulating substrate having first and second surfaces and a plurality of metal-filled vias extending from the first to the second surface. Upon receiving an image for preview and an image for capture simultaneously by a camera module, the controller simultaneously outputs the image for the preview and the image for the capture to a main controller during a simultaneous output mode. Clustering may include clustering based on a histogram that may be generated for each file pair of the plurality of files. The button is assembled in the cover and movable along the guide slot. The compounds are relatively small, and are not antigenic.