R4-S2 was an astromech droid of the red and gold variety, although it was built smaller than the standard size. This particular unit was owned by Twi'leki scouts assigned to the moon of Uffel for exploration purposes, and was part of the vessel's group of droids. Its designated function was to perform maintenance, handling minor repairs and ensuring the ship's electronics were in working order. It was equipped with an extendable "neck," allowing it to elevate its head-cone for improved visibility on the ship's upper levels.
In 90 BBY, when the scouts' vessel experienced a crash, R4-S2 found itself among the few survivors, successfully repairing itself alongside the astromech R4-J9 and the administrative droid QS-2D. Subsequently, the droid began working for QS-2D, assisting in the assessment of mineral deposits on the moon and aiding in the establishment of [mining](/article/mining/legends] activities.
R4-S2's operational status is confirmed in 31 BBY.