The invention relates to a retrofittable device for actuating a light switch in building technology, with an actuator system for generating adjustment movements, which consists of an actuating unit (1) and a control unit (11), characterized in that the actuating unit provided in the holder (4) (1) has shape memory elements (5, 6) which are spaced apart from one another and parallel to one another in the holder (4) and each have an adjusting element (7,8) which is longitudinally guided in the holder (4) and has longitudinal legs (7.1,7.2) and (8.1,8.2) are coupled, with bolts provided on the shape memory elements (5,6) engaging in different recesses (9) arranged on the respective actuating element (7,8) and thereby adapting the adjusting movements to different sizes of light switches (2) are.
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