I bought this new, but it didn't fit my house's doors. It has been opened once for testing. Retail price: 1540 yen For preventing mischief from babies and pets. The following is an excerpt from the manufacturer's website: ● Compatible with sliding doors and hinged doors with a gap of approximately 7-15mm in the installation area. ● May not be installed on sliding doors or hinged doors with uneven surfaces or slippery surfaces. ● Cannot be used on folding doors. ● After setting, make sure that the sliding door or hinged door is locked. ● To remove, hook your finger into the hole and slowly pull it out in the opposite direction of installation. ● When not in use, it can be stored by hanging it on a hook, etc. Precautions for use ● This product is for indoor use only and is a simple product for fixing sliding doors or creating a gap in hinged doors. It does not guarantee crime prevention, mischief prevention, escape prevention, or intrusion prevention. ● Check for any damage before use. ● Use in a place where the owner can see. ● If your pet has a tendency to bite, be very careful. If a broken piece is swallowed, consult a veterinarian immediately. ● Installation may not be possible depending on the material and shape of the sliding door or hinged door, such as sliding doors or hinged doors with uneven surfaces or slippery surfaces. ● Be careful not to pinch your hands or fingers during installation and removal. ● If excessive force is applied, the sliding door or hinged door may open, or the product may deform or be damaged. ● Do not use or store near fire, in hot places, or in direct sunlight. There is a risk of deformation or discoloration. ● Store out of reach of infants, children, and pets. ● Please note that we are not responsible for accidents caused by misuse. ● If the product is damaged, stop using it immediately. ● When disposing of the product and packaging materials, separate them according to the instructions of each local government.