A device that had the capability to transmit an immobilizer beam was known as an energy projector. This projector possessed the ability to disable various technologies, including starships and droids. Azmorigan, a crime lord of the Jablogian species, once attempted to sell such a device to Han Solo, the captain of the Millennium Falcon. Azmorigan claimed that the projector could disable technologies like starfighters and astromech droids.
The first mention of energy projectors occurred in the Knights of the Old Republic II: The Sith Lords: Prima Official Game Guide. It later made an appearance in the canonical comic, Powered Down, Part 1.