Locking and Unlocking---Special design of locking and unlocking methods. The three buttons require two hands to lock and can be easily operated and unlocked with just one hand (2 fingers). Simple and easy for adults, but difficult for children to use. Simple, understated design that blends in with your room's décor. Easy Installation---Tear off the 3M VHB tape and place the lever lock on the door to install the lock directly without drilling or using tools. 3M VHB tape is very sticky (will get better after 24 hours) and can be easily removed without any residue and will not damage the door. Wide range of applications: Suitable for most types of door handles on the market, it has a wide range of applications because it is more practical and smaller than similar locks on the market. Why you need it - No more kids or pets locking you or yourself in a room; Prevent children from entering specific rooms like toilets or storage areas without adult supervision; Prevent children from playing with doors and pinching fingers. Tips---Permanently unlock the safety lock when your children are not nearby. Make sure the arms cannot push up or down in the "locked" and "unlocked" positions.