LOCK AND UNLOCK : Special design of the locking and unlocking method. Three buttons will need two hands to be locked, and an easy operation to be unlocked using just one hand (2 fingers). Easy and simple for adults, but difficult for kids to use. Simple and discreet design that fits into your room decor. EASY INSTALLATION : Install the lock directly by peeling off the 3M VHB tape and placing the lever lock on the door, without drilling or tools. 3M VHB 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 as it is more convenient 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 toilets or warehouses without adult supervision; Prevent children from