This is the "DX Zeronos Belt," the transformation belt used by Kamen Rider Zeronos in "Kamen Rider Den-O." It is the item used to transform into "Kamen Rider Zeronos." The transformation is initiated by setting a "Zeronos Card" into the buckle in the center of the belt. In the show, there was a setting where the user loses their past memories every time they transform. The DX Zeronos Belt is a toy released by Bandai. This is a junk item that does not power on.