A passive memory device includes a plurality of resonant members, e. The device-protecting cover and the unit frame body constitute a unit chamber; and the units are disposed in multiple stages in said housing, whereby the other of the bent upper part surface or the bent lower part surface of said bent device-protecting cover is shielded. Methods for lightening skin are also provided and can comprise topically administering a therapeutically effective amount of a topical cosmetic composition comprising a Phyllanthus extract, a Bellis extract, and a licorice extract, to skin of a subject in need thereof.