Lock and Unlock --- Special design of lock and unlock method. Three buttons will need two hands to lock, and easy operation to unlock by just using one hand (2 fingers). Easy and simple for adults, but difficult for children to use. Simple and discreet design that fits into your room decoration. Easy Installation --- Install the lock directly by peeling off the adhesive tape and placing the lever lock on the door, without drilling or tools. Adhesive tape with strong viscosity (the effect will be better after 24 hours) and can be removed easily without any residue, without damaging the door. Wide range of applications: Suitable for most types of door handles on the market, it has a wide range of application because it is more practical and smaller than similar locks on the market. Why need it---no more children or pets locking you or themselves in a room; prevent children from entering specific rooms like restrooms or warehouses without adult supervision; Prevents children from playing