The Infrared Scope is an object that appears in Sonic X and it's comic book spin-offs. It is a scouting device used by Sonic in his infiltration of Area 99. Although not stated, they were most likely created by Chuck.
The Infrared Scope is a device worm on the right side of the head. It consists of a grey single-earpiece with a thin microphone and a red lens which fits over the right eye.