Invented by Resistance member, Alexander Tremayne, the Systems Interrogation Device or SID, is a maintenance tool for visualizing and manipulating embedded electronics. Designed with Na'vi scale in mind, it's made up of bespoke Resistance technology, combining RDA and TAP elements. The handheld device was designed to allow avatars and Na'vi in the Resistance to interact with human scale technology. Due to its unique components, it can be used to hack into RDA technology.