An exchange infrastructure system provides for the receipt, storage and transmission of limited data to uniform user interfaces to provide an improved exchange of data thereacross. The lever comprises a pair of locating portions pivotably received in the stiffener, an offset actuating portion between the locating portions, and an operating portion extending upward and frontward from an end of the locating portions and bent far away from the housing. The signal generating unit may use amorphous selenium, which is one of chalcogen materials, or CdTe or CdZnTe which is a compound material using chalcogen. A focus of the light that is transmitted through the electrooptic material becomes variable by varying an applied voltage between the electrodes of the incident surface and the electrodes of the exit surface.