A mobile terminal and a control method are provided. The sliding operation piece is provided with a reflecting pattern consisting of light reflecting regions and light absorbing regions. Priming consists in applying a voltage greater than a threshold voltage between the electrodes of the cells. The retaining mechanism, in the form of a wire rack, prevents the cover from moving forward or backward. A boot shaped membrane is applied over and directly welded to an interfacing location established between a proximate rooftop membrane and a further conduit wrapped membrane, such that the assembly provides a sectionalized and continuous vapor barrier across the roof and conduit.