Ventilation and safety: This window restrictor provides ventilation while enhancing safety in your home. It helps protect children by preventing them from pinching their hands when opening or closing windows without supervision. It also helps prevent children from climbing through windows. The restrictor is also effective in keeping pets safe. Adjustable and longer: These window restrictors are adjustable. Simply turn the knob to easily customize the window opening size. Universal and multiple uses: Our safety locks are designed for a wide range of applications. They are suitable for various window types, including inward-opening, outward-opening, and sliding windows, as well as doors and appliances like washing machines. They help protect childrens fingers from getting pinched between doors and walls and prevent children from accessing washing machines. Two installation methods: Choose between adhesive installation for quick and easy setup or screw installation for a more secure and durable fit. For optimal results, you can combine both methods. Screws are included. Easy operation: To unlock, press and hold the side button while sliding the middle button down. The window can then open fully as normal. To lock, position the ring correctly and slide the middle button up. The design allows for easy use by adults while remaining difficult for young children to operate. Note: All measurements are manually taken. Please allow a 13 cm error due to measurement variation. Color may vary slightly due to lighting and screen display differences. The actual product received may differ slightly in color.