Baby Safety Lock: 2 cable ventilator Designed for child safety, limiting window opening distance, safe ventilation. Ideal for Window Door Security. High quality material: Made from PVC, wood, aluminum and metal, always tested to standards. Easy to install: Can be easily installed on windows with four screws. Limits the distance a window can open. It can be removed from one end using the key, the windows can be opened fully. (The product comes with screws, which can be installed within easy reach, which is very convenient) Flexible cable at the length of 18.5cm (visible) allows you to open your window at about 10-18.5cm to effectively prevent children from causing accidents due to over-opening the window, to prevent pinching and cats can finally get in/out without opening the door or window wide or locking themselves in in the house! Keys provided: Can be locked and unlocked in seconds. Suitable for all materials: Suitable for most types of windows and small doors. Screws provided. White color Size: Cable length 18.5cm Quantity delivered: 2 pieces Product dimensions are all measured by hand, there are errors and the actual product shall prevail. Product color is affected by shooting light view and there is a slight color difference, which depends on the actual product received.