Video previewing methods for electronic devices with a touch-sensitive display unit for providing preview of a video to be played are provided. In addition or instead of the aforesaid arrangement, it is possible to provide plates made of piezoelectric material which vibrate in the flow of air that invests them, thereby producing electrical energy. In one specific arrangement, as the switch is moved from the open position to the closed position, the ice shield moves away from the contact structure of a moving contact of the switch to permit unfettered engagement with a stationary contact structure of the switch.