Thank you for viewing. I opened the product once and tried it, but it didn't suit me, so I'm selling it. It has been stored at home, so I would appreciate it if you could understand. The following is a description of the product from the website. 〈Dimensions etc.〉 Size: 8cm * 8.5cm * Thickness 1cm Storage: Push the center Materials: ABS, POM, TPE, 3M tape, stainless steel spring (environmentally friendly materials) 〈How to use〉 ● Protect your precious children from accidents Prevents children and pets from playing with their fingers or falling from windows. It is also possible to prevent them from opening furniture doors and sliding doors. It can be used for various sliding doors such as balconies, kitchens, living rooms, and windows to balconies. Prevents injuries to babies and prevents pets from escaping or getting lost. It also helps prevent burglaries and illegal entry. ● Easy to open and close Adults can easily unlock it by pressing a button. Please install it in a place that is out of reach of children. It is possible to create a safer home for your precious children. ● Uses durable double-sided tape. Uses super-strong double-sided tape. There is no need to drill holes, and no tools are required for installation. It is easy to remove and leaves no residue, and can be removed cleanly. It adheres firmly to the window, making it more convenient to use. * When removing, for safety, please warm the adhesive part with a hair dryer, etc. It will be easier to remove. * The double-sided tape is made by 3M or other external manufacturers. You cannot choose. ● Notes on installation 1. Cannot be installed if the window gap is less than 1cm. 2. Install within 10cm to 15cm from the window frame. 3. Leave it for about 24 hours after installation. 4. Install at a position more than 1.5 meters above the ground. Please stick it in a position where children cannot touch it.