Presently described are several alternate embodiments for shield devices to enclose and thereby prevent entrapment of objects in the interior space formed by elements of an adjustable bed in the raised position. The circular shift register having N data samples circularly shifts a first data sample of the N data samples into a data position at a first clock frequency. In some embodiments, each clip in the list of clips is selectable such that a selection of the clip causes the timeline to navigate to the position of the clip in the timeline. In those mode switching processes, power supply to a VRAM, the setting of a work area and a clock rate are changed. Thus, breaking of the wire due to concentration of shearing stress at one portion of the wire can be prevented.