R4-S2 was a smaller-than-normal red and gold astromech droid. It belonged to Twi'leki scouts who set out to explore the moon of Uffel, as part of their vessel's droid pool. Its responsibility was as a maintenance droid which made minor repairs and kept the electronics system functioning properly. It had an extendible "neck" by which it could raise its head-cone to see into higher levels of the ship. R4-S2 was active in 31 BBY.