Audio sensor

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An audio sensor,^[1] also known as an audio pickup,^[2] or auditory sensor,^[3] was a type of sensor that detected sound. The component was used in 3PO-series protocol droids,^[1] RA-7 protocol droids,^[4] and LOM-series protocol droids,^[5] installed in the lower head of enforcer droids,^[source?] and was also featured in the helmets worn by Imperial stormtroopers.^[2]