Sentry Droid

From KeenWiki

You may spot these seemingly mindless sentries throughout the Droidican cities on Droidiccus Prime. The Droidican Emperor uses them to keep tabs on his soldiers. They are indestructible, so don't mess with them.

Being remote controlled, they are not very intelligent, merely whizzing around the place trying not to bump into anything. The will shock you on contact but are harmless if you can avoid them.