New, Unused I bought this to prevent my child from opening doors, but I'm selling it because I didn't use it and the time has passed. The following is an excerpt from the website: Installation is very easy, just attach it with double-sided tape. Easy to use It can be used simply by pressing the release button and lifting the lever. Release button To prevent children from releasing the button, the lock can only be released by pressing the button firmly. Door knob scratch prevention By hiding the screws inside the lever, we have prevented scratches on the door knob. Lever indentation By slightly indenting the lever, we have created a catch, allowing the lever to move more smoothly.