When was the Japanese Super Sentai series GoGo Sentai Boukenger first introduced?
GoGo Sentai Boukenger
Precious(プレシャス,Pureshasu) are the dangerous treasures that the Boukengers and Negative are fighting over. For a relic to be considered a Precious, it must be physically or technologically superior to any current human (or SGS-related) technology. The hand-held Accellular henshin devices use their half-open Scan Mode to determine the "Hazard Level" of each relic; the higher the number, the more important or dangerous the Precious is. Each relic that ends up in the Boukengers' hands is placed into a box that materializes from a card-like device.