Welcome to our shop This product is designed to prevent safety hazards by controlling the distance a door or window can be opened, minimizing the risk of accidents caused by unsupervised access. It comes with 3M adhesive for easy installation, and is made of environmentally friendly ABS material that is durable and resistant to breakage. The size of the product is 9cm*7cm*4cm, and each package includes several units. Simply pull the wings on both sides to engage the lock, providing a clear visual indicator of its status. For optimal performance, ensure the surface is clean before applying the product, and allow 24 hours for the 3M adhesive to fully bond. This safety lock is easy for adults to operate, while effectively preventing children from opening the door or window. Please note that while this product helps minimize safety hazards, it is not a substitute for adult supervision. It is recommended to use two to four locks for each door, and slight variations in individual products may occur due to manual measurement and display differences. 100% Satisfaction: Our customers are our top priority. If you find any product problems after receiving the goods, such as damage and incorrect quantity of goods, please contact the seller immediately. We try our best to provide you with satisfactory after-sales service.