Chiba DR-10
From Wookieepedia, the Star Wars wiki.
The Chiba DR-10 was a hovering spherical protocol droid used by the Galactic Empire, specializing in translation, negotiation, and legal advice. It was referred to, colloquially, as the "Chiba Drio." The Chiba could be equipped with a pop-out blaster for aggressive negotiations. While so equipped, it could function adequately as a guard, patrol, probe, or security droid. Useful and adaptable as the Chiba was, it did have one notorious flaw. Over time, they tended to become impatient, irritable, sarcastic, and sometimes even aggressive.
