Locking and unlocking---special design of locking and unlocking methods. The three buttons require two hands to lock, only one hand (2 fingers) can be easily unlocked. It is simple and easy for adults, but difficult to learn. use for children. The simple, understated design blends with your room decor.Easy to clean. install---Tear off the 3M VHB tape and place the lock to lever on the door to install the lock without drilling or tools. 3M VHB tape has a viscosity of high (best effect after 24 hours), can be easily torn off, no residue, no damage to skin. the door.Wide range of applications: it is suitable for; most kinds of door handles on the market, because it is more practical and smaller than similar locks on the market, so it has a wide range of applications.Why in do you need --- no more children or pets locking you or yourself in a room; prevent children from entering certain rooms without adult supervision, such as toilets or warehouses; prevent children from playing with the doors and pinching their fingers.Tip --- When your child is not there, unlock the safety lock. permanently. Please ensure that the arm cannot push up or down in the "locked" positions and "unlocked".