I tested it quickly: The magnet and sensor may be max. 1.5 cm apart for me so that the status is considered "closed". Apart means: product photo 1, distance max. 1.5cm. Everything over 1.5cm indicates the status "open". I.e. you could probably attach the sensor/magnet to the bottom of the window in such a way that they just do not touch when the window is tilted in order to still receive the "closed" status.