Ventilation & Adjustment - - - Our window limiter is adjustable and can protect children while fulfilling the function of ventilation. Available in two different opening sizes, 9.2 cm (3.62 in) and 13.5 cm (5.31 in). Press and hold the sliding button on the lever to push and pull the window, which adjusts the size of the window opening. Why need it - prevents babies from getting their hands stuck when opening and closing windows without adulterous supervision; Mayor of the city of Montel - sur - mer; It was a small accident. The most effective thing is that it is not a punishment for babies, but for company animals. UNIVERSAL AND DURABLE - Made with PA66 + GF20 materials, the sturdy and durable product is made of two parts. No one will use internal and external resources.