- Main article: The Massive
SIR (Standard-Issue Information Retrieval) Units are robots designed to assist invaders in their missions. They help gather information on their master's assigned planet. GIR, Zim's SIR Unit, is a malfunctioning SIR Unit built from spare parts. Because Zim is not an official Invader, the Almighty Tallest didn't want to give him a proper one, so they put garbage inside GIR's head instead of a proper brain.
SIR Units are unable to reproduce because they are robots. However, they appear to have two sexes. MiMi is a feminine programmed SIR Unit. She was made by Tak, and is more powerful than most other SIRs.
The PAK is a tool attached to each Irken's spine seconds after birth. The PAK can come off, as shown in NanoZIM. However, if an Irken is forcefully separated from the PAK, they can only survive up to ten minutes without it. The small, backpack-like piece of equipment holds an Irken's memories, although Irkens still have brains, as shown in the episode Bad, Bad Rubber Piggy when Zim writes a note to his past self, telling himself not to use the time machine. PAKs also hold a number of tools, such as spider legs, a communication device, an organ-stealing contraption, etc.
Irkens have very advanced computer systems, which give them a wide variety of information, like most Earth computers. These computers have the ability to speak, and apparently cough, as shown in the episode Walk for Your Lives. Zim's computer is referred to simply as Computer, and is installed all over the house so Zim can talk to him at any time.
Because Zim was the first Irken to discover Earth, the Irken Computers are not yet programmed with any information on the human race. In FBI Warning of Doom, Zim asks Computer to find all information on the FBI. However, Computer makes everything up, and claims that it was founded by demons. He coughs in the episode Walk for Your Lives, and even Zim did not know he had the ability to cough. Computer also alerts Zim if there is an intruder in the house. Even Dib has a computer like Zim's. It doesn't seem to be as advanced, but it can somewhat overpower Zim's (when hooked into Tak's Ship). His is pretty good with finding real info, as opposed to Zim's Computer's habit of making "educated" guesses.
The Voot Cruiser is the most common Irken transportation devices. It is purple in color, and extremely fast, as it can apparently exit the solar system in mere minutes. It is the spaceship Zim uses to travel from Conventia to Earth. It has two tractor beams, and a port through the bottom of the rear to lower one's self into one of the beams. Zim is the only Irken seen to be in possession of a Voot Cruiser, which may imply that it is outdated compared to other ships in the Armada. He also has a ship virtually the same as the Voot, only loaded with more weapons.
The Irken PAK allows an Irken to breathe in any atmosphere. If a planet has no atmosphere, a space suit is needed. Zim can be seen wearing his space suit in the episodes Planet Jackers and Battle of the Planets. The space suit consists of a bubble-like air helmet, which can turn invisible, and a jet-pack for the ability to move in space. The space suit is purple in color and appears to be armored.
Irkens also have teleportation technology. This is shown in the episodes The Nightmare Begins when the Announcer tells the Irkens to take the complimentary teleporters to Conventia's surface, and in Bloaty's Pizza Hog when Gaz takes a teleporter to Zim's Space Station.