Baby Safety Lock: 2 Cable Restrictors. Designed for child safety, limiting the window opening distance and ensuring safe ventilation. Ideal for patio door safety. High-Quality Material: Made from PVC, wood, aluminum, and metal, always tested according 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, allowing the windows to be fully opened. The flexible cable, 19 cm long (visible)*, allows you to open your window approximately 10-19 cm, effectively preventing children from causing accidents due to excessive window opening. This also prevents pinching, and finally allows cats to enter/exit without having to fully open the door or window or lock themselves inside! Keys included: Can be locked and unlocked in seconds. Suitable for all materials: Fits most types of small windows and doors. Screws included.