LOCKING AND UNLOCKING --- Special design of locking and unlocking system. Three buttons require two hands for locking, while one hand (two fingers) is enough for unlocking. Easy and convenient for adults, but difficult for children. Simple and discreet design that blends in perfectly with your room decoration. EASY INSTALLATION --- Install the lock directly by peeling off the 3M VHB adhesive tape and placing the lever lock on the door, without drilling or tools. The high-viscosity 3M VHB adhesive tape (The effect will be better after 24 hours) can be easily removed without leaving any residue and without damaging the door. Wide range of applications: Compatible with most door handles on the market, it offers a wide range of applications thanks to its practicality and smaller size compared to similar locks. WHY --- No more need to let your children or pets lock themselves in a room; Prevent children from entering specific rooms like restrooms or warehouses without adult supervision;