You will receive a Christmas card as a gift for the Christmas Day! High Quality Material: The window safety lock is made of high quality ABS material. Each stainless steel chain can withstand gravity up to 10kg and is not easily damaged when pulled. It was specially developed to protect children and pets. It can block windows, sliding doors, balconies and other dangerous places to prevent babies and pets from falling out of windows when playing. Two Installation Methods: The child safety window restrictor can be installed in two ways: drilling holes or pasting. It does not fall easily and does not damage the surface of furniture. It is the best choice, especially if you cannot use screws for installation. No keys or passwords are needed. Press the button at the same time to open it. Adjustable Chain: You can adjust the length of the chain to determine the size of the gap to ensure proper ventilation and at the same time ensure the safety of your child and pet. The size of the slot varies between 3.5cm and 19cm, which allows for better air circulation. Dual Switch Mode: The dual switch unlock mode of the child safety window requires pressing the buttons simultaneously to open the window. It can provide children with double protection, not only allowing fresh air to penetrate, but also effectively prevent children from pressing one of the buttons to unlock the dangerous situation. Wide Application: Window child safety locks are widely used on most UPVC, metal, wooden, casement and sliding windows. The best choice for limiting the opening distance, perfectly blocks any danger in your home and you no longer have to worry about the safety of your children or pets windows.