Fantastic cat litter system. It came well packaged and was a snap to assemble.  The cats went right into the open doorway (they didn’t care for the flap that is included.)  The pan is lined and holds a regular sized box of litter.  The plant on top is a nice touch. The deodorizer works really well. It does make a slight humming sound while operating.  But there is an onoff button, so it needn’t stay on all the time if that is an issue.