The present invention relates to a power control apparatus and method for preventing a system from being repeatedly booted and shut off by re-setting a cut-off voltage when the system is shut down by a cutoff mode. The detector aperture element is fixed relative to the chromatically dispersive optics of the optical pen, the optical fiber abuts the aperture element, and the optical fiber core is aligned to the aperture. Based on the user’s progress towards the goal, the electronic device can provide a workout reminder. When the main side member of the slide is exposed to a lateral wind load, the spoiler creates a flow separation that kills the lift generated by the airflow. When this material is manufactured, the back side of a leather or a leather-like material is laminated to a layer comprised of a soft foam, whose outside oriented away from the leather or leather-like material is flocked with staple fibers.