- "An invisible spy could operate with impunity."
- ―Samantha Carter[src]
The Reetou Karesh was a device used by the Goa'uld to become invisible to human perception. Hathor had a cloaking device prior to escaping the SGC. She also had it on Eskal. Nirrti experimented with phase shifting technology in an attempt to better fight the Reetou, but the SGC recovered her device when she followed SG-1 through the Stargate. Anubis later gave one of his Ashraks a cloaking device, and used it to go on a killing spree at the Alpha Site. (SG1: "Fair Game", "Rite of Passage", "Allegiance")
The device worked by phase shifting the user to become invisible, but caused the wearer's movements to become limited as well as restricted. (Stargate Resistance)
Behind the scenes[]
Considering the name possesses the term Reetou, its possible that these devices work by reverse engineering that species phase shifting physiology.