Abstract: A smart film apparatus includes a smart film and a control member. The smart film includes a polymer dispersed liquid crystal or a polymer network dispersed liquid crystal between two conductive layers. Plural electrodes are formed on a single surface of one of the conductive layers, and it is easier to process. Two conductive layers that respectively include multitudes electrically isolated conductive units. With floating or ground controlling signal, the control member controls the conductive units to perform a variety of displaying effects. Moreover, the surface opposed to the single surface with electrodes is evenly flat with paste and beneficial to apply to desired target surface.

Abstract: A cover includes a rubber main body, and several clipping elements; the main body has a hollow truncated-cone shaped portion, an annular or square connecting portion around a lower end of the truncated-cone shaped portion, a longitudinal aperture extending from the upper end to an outward edge of the annular portion, and first and second elongate protrusions along those edges thereof that are adjacent to the longitudinal aperture; the first elongate protrusion has an uppermost covering portion capable of closely touching an upper side of the second protrusion; the clipping elements are used to clamp the first and the second elongate protrusions together so as to close the longitudinal aperture after the rubber main body is positioned around a pipe passed through a part of a building to prevent leakage through the joint between the pipe and the part of the building as a best property.