This is a door stopper from Marna that can be released by pushing the door. I purchased it, but after opening the package, I found that it doesn't fit the height of my door, so I'm selling it without using it. I will ship the main unit and instruction manual in the original box. It's in good condition, but please refrain from purchasing if you are sensitive to minor imperfections. Please check the photos for the condition before considering a purchase.