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| Technical specifications
R2 units were a very popular series of astromech droids produced by Industrial Automaton. They stood at around 1 meter in height, and were programmed to perform a variety of task. They were designed to be able to fit in the droid sockets commonly found on starfighters. R2-D2 was a notable example of this model. Another was R5-D4, who, despite carrying the prefix "R5" was described as an "R2 unit."