Emergency equipment stations distributed throughout a facility monitor one or more internal or external conditions and relay information about the monitored conditions to a central station. The first thermal treatment may be a rapid thermal annealing step, while the second thermal treatment may be a rapid thermal nitridation step. When the trays are vertically stacked, a positioning portion of an upper tray is engaged with a gap between an inner side wall of a recessed cavity and a semiconductor package received in a lower tray, so as to securely position the semiconductor packages accommodated by the lower tray. The magnetic field interacts with a magnetic field of the magnet to generate a magnetic force driving the lens unit into telescopic movement.