The Reetou Karesh was a device of Goa'uld design which worked as a phase shifting Cloak thus granting Ashrak the ability to become invisible. However, when using these advanced pieces of technology, the wearer's movements were limited as well as restricted. (Stargate Resistance)

Considering the name possesses the term Reetou, its possible that these devices work by reverse engineering that species phase shifting physiology.

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