SD-7, a Communications droid of the Imperial variety, acted as an aide to IMP-22. The primary purpose of SD-7 was to transmit communications from Imperial operatives scattered across the galaxy to an Imperial commander of significant rank, whom both IMP-22 and SD-7 were under. SD-7's method of communication was droidspeak.
SD-7 possessed the capability to engage in combat. In combat mode, the diodes on its frame, which were normally blue, would change to red. The legs of the droid would extend, approximately doubling its height and raising its main body, and a small blaster would deploy from the underside of the main body. This blaster had a firing range of 360 degrees.
In general, its weaponry was employed as a means of addressing commanders who were either treacherous or inept.