You can keep your child safe around the windows with the Window Safety Lock that prevents fall injuries while allowing ventilation. The lock fits inward and outward hinged and vertical slide wooden windows. Notice that children around four years old might be able to operate the childproofing mechanism. With the Window Safety Lock, you’re not only protecting your little one from fall injuries in the home – you’re taking responsibility for the environment that your child grows up in, too, as the packaging is 100% biodegradable and Cradle to Cradle certified. This means that it will naturally decompose and leaves nothing behind that damages our planet.