Guardian Angel keeps little kids from window falls and adds additional protection to your home giving you some added peace of mind. An ultra high quality product that keeps curious children inside. Use the Guardian Angel with a variety of single or double-hung windows as well as sliding and casement windows for ultimate protection. All necessary hardware is included for same day installation and use. Quick release buttons are an additional safety feature that parents will love for the forethought. Three sizes to choose from including this one. Lifetime Manufacturer Warranty.Works for windows 23-35.