An interior rearview mirror assembly for a vehicle includes a casing having a human machine interface thereat. The human machine interface includes at least one user actuatable input integrally formed at a portion of the casing during the molding operation that forms the casing. The mirror assembly includes circuitry. The user actuatable input may be actuatable by a user to operate at least one element of the circuitry. The human machine interface may be at least partially at a bezel portion of the casing, or may be at least partially at a rear casing portion of the mirror casing.