The Principate-issued Principate Language Decoder is a wrist-mounted accessory that allows the wearer to translate a variety of languages via audio and video capture, displaying the translation on a viewscreen that takes up the majority of the wrist unit for easy reading. It was created by members of the Harmonist sub-faction of the Severian Principate, and this one was issued by the Harmonists to the most valiant Brotherhood members of that sub-faction.