[Safety Design] : The safety limits of window locks are designed to limit the distance to open Windows and doors to help reduce the risk of fall injury. Suitable for most doors and Windows (horizontal or vertical). [Effective monitoring] : No adult supervision at the window; Prevent a baby from accidentally falling out of a window or door. It doesn't just work for kids, it also works for pets. [Adjustable] : Our window is adjustable and may protect children while conforming to the ventilation function. Two different opening sizes are available :5.12 inches (13 cm) and 6.30 inches (16 cm). Just change the knob and adjust the door spacing. [Sticky] : These restricted Windows have strong lock stickers that can be securely installed without drilling. All you have to do is take the protective film off the lock and hang it directly on a window or door (it will work even better after 24 hours). At the same time, the hair dryer is easy to remove and won't damage the window surface. [Perfect service]: If you are not satisfied, we will provide 100% exchange service or refund within 30 days. If you have any questions about the setting of child safety locks, please contact us! We will provide a satisfactory solution within 24 hours.