✅【Child Safety Lock】This stopper prevents children and pets from playing with things, pinching fingers, and falling from windows, and prevents them from opening furniture doors and sliding doors. Use it on windows/sliding doors in balconies, kitchens, living rooms, and balconies. It prevents babies from pinching their fingers and getting injured, prevents pets such as dogs and cats from escaping or getting lost, and prevents burglaries and illegal entry. It is also effective as an "auxiliary lock" for crime prevention and earthquake countermeasures. It also often prevents pets from leaving the room. ✅【Easy to Open and Close】This is a window/door safety lock for pets and children, but adults can easily open it by simply pressing a button. It locks securely, and adults can easily unlock it, but children cannot unlock it, so it is very helpful. It creates a safer and more secure environment for children. Materials: ABS, POM, TPE, 3M tape, stainless steel spring (environmentally friendly materials) Size: 8cm * 8.5cm * 1cm thick (push the center for storage) s21-20-15