Aris Boch's goggles
From The Stargate Omnipedia
Headpiece used by Aris Boch, worn over the eyes, nose and upper mouth. The device acts similar to a voice modulator in that it artificially morphs the human voice to sound similar to that of a Goa'uld, giving the bearer a potential tactical advantage when dealing with symbiotes.
The goggles possess sophisticated zoom capabilities. They may be tied in to Aris's tracking device and rifle.
KEY EPISODE
Deadman Switch - With the help of his goggles, Aris hunts Keltar by way of capturing SG-1.