A button ball and alignment rib formed to a bezel mates with an aperture on a floating button cluster to align and secure the floating button cluster such that the buttons of the floating button cluster are aligned with their corresponding apertures formed in the bezel. The first mobile device includes a status indicator configured to provide a persistent visual indication to a user of the status of a mute function of the first user device during the active communication. The manufacturing method of ground-buried solid type insulation transformer comprises 9 processes in total. In response to when a product quality issue arises using the decision rules when producing products according to the product raw material combinations helps to quickly determine the sources of unqualified product raw materials and improves product quality safety. A microprocessor is coupled to the magnetic field sensor such that upon sensing the select arrangement of magnets by the magnetic field sensor, the microprocessor establishes an identification setting based upon the select arrangement. , are provided as operation modes that differ from an operation mode accommodating a genuine product and are enabled to be selected by a user when a toner cartridge containing a toner that is a product other than a genuine product is mounted.