Abstract: A Venetian blind has a plurality of slats which can be set together at any angle or be drawn up together with a plurality of cords. The slats are made of a material conductive to electricity and are provided on two longitudinal side edges thereof with an insulation strip for preventing an electrical shock. The slats are connected at both longitudinal ends thereof with a power source. When the slats are drawn down, the slats are electrically charged so as to electrocute an intruding insect. When the slats are drawn up together, the power supply to the slats is interrupted.