A static mixer is provided with a first grid having one or more crossing elements and one or more slots and a second grid having one or more crossing elements and one or more slots. The mobile phone includes a housing, a printed circuit board, a connector, and a microphone. Image data corresponding to the detected patterned light is compared to reference image data to verify a state of overlay mismatch of reticle pattern accuracy prior to wafer exposure. In other embodiments, such a peripheral is provided without mouse-like functionality, and again permits reading machine-readable indicia printed in catalogs and the like.