Indeed this is a very interesting artifact, the fact that it was designed by Léon Theremin, and the technical know-how that went into it. > Because it was pass

Indeed this is a very interesting artifact, the fact that it was designed by Léon Theremin, and the technical know-how that went into it. > Because it was passive, needing electromagnetic energy from an outside source to become energized and activate, it is considered a predecessor of radio-frequency identification (RFID) technology.