Maintenance droids of the Trade Federation represented a robust and rudimentary design, utilizing treads for mobility. These droids were purposed to clear ventilation systems of the Trade Federation's Lucrehulk-class battleships of accumulated dust and waste. The droids employed electric shocks, potent enough to harm Humans and likely other carbon-based lifeforms, to eliminate unwanted substances. Furthermore, they were equipped with motion sensors, triggering their electrical discharge upon detecting any movement.
During the year 32 BBY, Obi-Wan Kenobi encountered several of these droids while navigating the ventilation ducts of the Saak'ak.