Special Removable Design: Our window stoppers are keyless, so you don't have to worry about losing your key and being unable to open the window. The special detachable design makes it easier to adjust the window opening position and secure the window with a smaller distance. Prevents Infants from Falling: Helps secure the window and meet ventilation requirements. The maximum window opening distance is 2.76 inches (7 cm), much smaller than the distance an infant can fall out of the window. No Infant Required: The window lock can withstand a push force of 27 kg and a pull force of 30 kg, eliminating the worry of an infant opening the window and falling. You also don't have to worry about strong winds shutting the window. It won't damage the window or scare an infant. Aging-Resistant: The window stoppers are installed using an adhesive, requiring no drilling or tools. The adhesive is strong (it works best after 72 hours) and can be easily removed without leaving any residue or damaging the window. The strong adhesive tape is temperature-resistant from -30C to 90C, ensuring safety in hot summers and cold winters. Waterproof and Wide Application---PC and ABS materials make it stronger and extend the service life. The waterproof material and tape allow you to not worry about rainy days. The window limiter can be used for swing windows and casement windows.