I bought this to install a lock on my room because I'm in puberty and I hate people entering my room without permission, but I was told to move out if I put a lock on the door, so I'm selling it. It was discovered the moment it arrived, so it's brand new and unopened. Please buy with confidence. Can be used on sliding doors and windows. For preventing mischief by babies, cats, dogs, and preventing parents from entering, etc. Sliding door lock Window stopper Baby guard Baby Cat Dog