Abstract: A waterproof cover for an audio system includes a frame and a shield pivotally connected to the frame. The flame has two elongated recesses respectively defined in two opposed sides defining the through hole and an inclined trough sandwiched by the two elongated recesses and defined in a bottom side defining the through hole. The shield has two rails formed on two opposed sides thereof to correspond to and be movably received in the two elongated recesses, a water blocking flange sandwiched by the two rails and formed on a bottom side of the shield to correspond to and be received in the inclined trough and a flange formed on a top side of the shield to abut a top side defining the through hole such that a full coverage of the through hole by the shield is completed and water seeping from engagement between the shield and the frame is reduced.

Abstract: A waterproof cover for an audio system includes a frame having an opening and two arcuate faces respectively formed on two opposed sides of the frame, a gasket and a shield with the gasket securely attached to a side face thereof and being pivotally connected to the frame in such a way that a pivotal trajectory of the shield is eccentric to the arcuate face thereby allowing the shield together with the gasket to engage with the arcuate faces of the frame in a watertight manner.

Abstract: An electronic apparatus having an automatic lifting/lowering device includes a casing and a piston. The piston is installed inside the casing having a rack gear. The piston includes a loudspeaker mounted on top of the internal machine. A power source drives an electrical motor to move with the electronic apparatus installed at an appropriate location. The electrical motor is coupled with the rack gear correspondingly. When the power of the electronic apparatus is on, the electrical motor and the rack gear move oppositely, so as to make the electronic apparatus on top of the piston protrude from the casing. When the power of the electronic apparatus is off, the electrical motor makes relative motion in a reverse direction with the rack gear, so that the electronic apparatus of the piston is drawn back inside the casing.