Eyes of the Master
From Wookieepedia, the Star Wars wiki.
The Eyes of the Master was the name Ygabba Hise and the other children under Gilramos Libkath's control gave to the tracer orbs implanted in the palms of their hands. The Eyes of the Master acted as miniature cameras, capable of sending detailed visual information back to Libkath. They would also secrete a deadly poison into the body should the child try to escape, or so Libkath claimed.
