The present invention provides a system and method for reserving space to guarantee file writability in a file system supporting PCPIs. A loudspeaker is configured to convert the adjusted audio signal into acoustical sound. The securement device includes an operating lever swivellable about a lever swivel axis, by which the operating lever is displaceable between the closed position and the open position. The modular pods include a plurality of spring members, which may have varying elasticity or resistant levels.