Watcheyes were mobile surveillance devices connected to the Omnius evermind. They were the means with which Omnius would interact with the environment, in any place. Omnius could often speak to Erasmus via the watcheyes that flew near his villa.
Watcheyes could be used by droids as communication gadgets, and they also had a holographic projector.
Beowulf had found a way to create an instructional loop that placed false recordings into the watcheyes, allowing the Titans to hold secret meetings against The Evermind. Yorek Thurr, the trustee governor of Wallach IX used such techniques to hide his deed from Omnius.