The Sinrich optical dephaser was a small-scale cloaking device that could be used for various purposes, such as vehicular cloaking or invisible camouflage for hunting and hand-to-hand combat. Shortly after the rescue of Hera Syndulla by the Spectres on Lothal in 1 BBY, the Imperial Noghri assassin, Rukh, used the Sinrich optical dephaser to fight against Sabine Wren and Garazeb Orrelios. The dephaser was similar to the holographic disguise matrix, which was invented by the Snivvian bounty hunter Sinrich.
During the Imperial–Grysk conflict, Darth Vader noted that Rukh's cloaking device was Chiss technology. Grand Admiral Thrawn confirmed this, but noted that the device could not work on Chiss individuals themselves.