QUALITY MATERIAL: This child safety lock for doors and windows is made of ABS and thickened stainless steel chain, as well as transparent non-marking adhesive, corrosion-resistant, firm and durable, safe and odorless, strong adhesive, not afraid of the baby pulling it. ADAPTABLE DESIGN: The total length of the child safety lock for doors and windows is 24.5 cm, and the length of the adjustable chain is 20.5 cm, which allows the window to be opened individually, ventilating the restriction, and the window to be opened with more space when installed in parallel. When installed in parallel, the opening space is larger; When installed off-set, the opening gap is narrower. EASY TO INSTALL: Child safety door and window locks combine transparent non-marking adhesive and perforated installation. Before use, just clean the surface of the furniture to confirm the position, tear off the protective film, paste directly, or as needed, and then screw on to ensure double security. DOUBLE LOCK: The first step to use the child safety lock for doors and windows is to press and hold the right button, and the second step is to slide the switch, which is simple and easy for adults to open, but difficult for children, double switch design, give your baby a safe home. WIDE APPLICATION: Child safety locks for doors and windows can be used for washing machines, cabinets, wardrobes, toilets, wine coolers, refrigerators, doors and windows. Can be used to prevent your little adventurer or cute pet from going into dangerous places, blocking any potential danger in your home.