Improved childproof door lever lock requires an adult to push the release button on both sides of the lever. This can easily be done with just one hand. A toddler's hand isn't as big as yours and he or she will not open the lock. This is a big improvement over other lock designs sold on Amazon. Those only require a single button to be pushed. Clever toddlers and small children can push the single button and open the door. Most kids can't open our 2-button design. This lets you sleep soundly at night knowing your child is safer from harm. Product Features: .4-Pack Childproof Door Lever Locks .Improved design prevents kids from opening .Adults easily open with one hand .Made of hard, durable ABS plastic .Designed for years of daily use .Super easy installation in just seconds .3M adhesive backing holds firm .No tools or drilling needed Includes complete easy to follow installation and operation instructions.