Adjustable Window Gap Size --- With the window restrictor, two different window opening sizes can be chosen, 3.62 (9.2 cm) and 5.31 (13.5 cm). The adjustable window gap size can meet daily ventilation requirements and more customers' needs. Why is it necessary --- The window lock is strong enough because it is made of polyamide material. 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 babies but also for pets. Easy Unlock --- Press the double button to unlock the lock and the window can be opened or closed freely. No keys or other parts are missing with the lock installed. Adjust the window gap by long pressing the sliding button on the pole and pushing or pulling the window. Easy for adults to use but difficult for babies. Easy to Install Tips --- The window restrictor provides tapes and screws for customers to install. With the tapes, it can withstand less than 58 LBS (the