Feature: 1. Usage: Window stoppers prevent window from opening excessively and avoid accidents, increasing the safety of window in your home. 2. Easy Adjust: Child safety window stopper height can be adjusted for a variety of window sizes, provide flexible window security protection. 3. Widely Use: Child safety window lock suitable for internal opening, external opening, downward opening window, moving door, wardrobe, etc. 4. Easy Installation: Children protection window lock is easy to install, no tools required, which can keep your child safe without extra time and effort. 5. Safety Material: Child safety window restrictor made of ABS, POM, and metal materials, firm and strong, can be used for a long time without broken. Specification: Item Type: Child Safety Window Restrictor Material: ABS, POM, Metal Size: Approx. 27.5 x 16.5 x 5cm / 10.8 x 6.5 x 2in. Package List: 1 x Window Retainer 1 x Regulator 4 x Screw 4 x Expansion Tube 1 x Manual Note: For the first installation, press the gel firmly and stick it for 12 hours before use.