The invisibility device is a device which cloaks the wearer.
Functions[]
The cloaking device is a small device strapped around the arm. When the button on it is pressed, the wearer is shifted into an alternate dimension, which renders them invisible for people in the normal dimension. Only wearers of the same device or people who are affected by Arthur's Mantle can see the cloaked people and vice versa. However, users of Merlin's device remain in another dimension and even though they can be seen by a cloaked person, they still cannot be physically interacted with. (SG1: "Arthur's Mantle")
The device gives off radiation which is harmful to humans over long-term exposure (Jaffa are protected from it through their symbiotes, and Ancients through their advanced biology), but it is necessary to prevent interdimensional parasites from bleeding through into the dimension humans occupy. (SG1: "Uninvited")
Though created by the Sodan, the devices were based on technological instructions left behind by the Ancients, and it is unlikely the Sodan actually understand the workings of them.
History[]
When the Sodan left the service of the Goa'uld, they settled on a world occupied earlier by the Ancients. There they found technological instructions which allowed them to build the cloaking devices.
When SG-1 first visited the planet, they became aware of the cloaking devices but couldn't study them. Jolan often used one during Lt. Colonel Cameron Mitchell's training much to Mitchell's frustration. (SG1: "Babylon")
While going up against the Prior Damaris, the Sodan allowed Mitchell to use one of their cloaking devices to try to capture him. However, the Prior easily disabled the device with his powers. (SG1: "The Fourth Horseman, Part 2")
When the Sodan were wiped out by Volnek, who was turned into an undead monster by a Prior of the Ori, Teal'c used one of them to fight against Volnek and eventually defeat him with the aid of Mitchell who had been put into another dimension by Arthur's Mantle. As a result, Mitchell was visible to both Teal'c and the undead Volnek, but couldn't be harmed by the latter. Afterward, the SGC collected all cloaking devices and brought them to Earth to study them. (SG1: "Arthur's Mantle")
Once the devices were analyzed, the radiation was detected and eventually disabled; however, when the SGC used them to spy on Ori-controlled worlds, they accidentally set free the parasites, which mutated animals into monsters. One cloaking device was stolen by a member of The Trust who inadvertently caused the parasites to be set free on Earth. All of the monsters were exterminated by members of the SGC. (SG1: "Uninvited")
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