An apparatus for identifying an unknown DNA sample. The COB package has conductive patterns as contact terminals on an outer surface of a non-conductive film, and an IC chip on an inner surface of the film. This applied pressure flexes the substrate to reduce in-plane stresses, wherein removal of the applied pressure after deposition of the thin film modifies the in-film stress for the thin film. Thereby, not only the function of the conventional NMOS transistor served as a switch can be achieved by the switch-block, but also the element size, turned-on resistance value and turned-off parasitic capacitance value of the switch-block, and the power consumption of the RF application circuit thereof can be reduced. Each basket comprises a first grate and a second grate, retained in pivotal relation by a pair of hinge clips.