This product is designed to control the safety gap when opening doors or windows, preventing babies from opening windows at will. First, clean the surface and remove the adhesive backing from the sliding door lock. You can use a hairdryer to warm the glass and rubber surface before pressing the product firmly into place. After installation, wait 24 hours before use to ensure optimal adhesion of the 3M tape. The product comes with 3M adhesive for easy installation. Features include easy operation for adults while being difficult for babies to open. Made from eco-friendly ABS material, durable and not easily broken. Size: 9cm x 7.5cm. Simply pull the wings on both sides of the door lock and press flat. Easy to identify whether it is securely locked. This product is intended to help avoid safety risks and reduce injuries. It is not a substitute for adult supervision. It is recommended to install two to four units per door. Baby safety features: Prevents accidents caused by children opening doors and windows freely. Smooth finish, attractive appearance, enhances room decor. After installation, adults can easily open the door while children cannot. Simple to install and operate. High toughness, not easily damaged. Color: White Package quantity: 8 pieces Note: Measurements are manually taken; please allow 1-3cm error due to variations in lighting and screen display. Color may vary slightly depending on screen settings. Actual product may differ slightly in color.