Adjustable Window Gap Size --- With the window limiter, you can choose between two different window opening sizes, 3.62" (9.2 cm) and 5.31" (13.5 cm). The adjustable window gap size can meet daily ventilation needs and the needs of more customers. Why It Is Needed --- The window lock is strong enough because it is made of polyamide. Don't hesitate, it can prevent children from playing with windows and pinching their fingers, prevent children from falling out of windows, etc. Not only for infants but also for pets. Easy to Lock and Unlock --- Press the double button to unlock the lock and the window can be opened or closed freely. No key or other parts are missing with the lock installed. Adjust the window gap by pressing and holding the slider on the post and pushing or pulling the window. Easy for adults to use but difficult for infants. Easy to Install and Guidance --- The window limiter comes with tape and screws for installation. With the tape, it can bear less than 58 LBS (the effect will be better after 24 hours). Choose the appropriate installation method based on the actual requirements. Wide Range of Application --- Used for inward opening windows and outward opening windows. Suitable for most windows on the market.