This is the retractable pet barrier that prevents dogs from running outside while you greet guests at the door. The unit mounts easily to any door frame and houses a vinyl barrier that clips to the door and unfurls when the door is opened, creating a 31" high, impenetrable blockade. Unlike typical pet gates, the opaque barrier creates a psychological obstacle by preventing pets from seeing what's outside, causing them to lose interest. The vinyl barrier is tear- and puncture-resistant and unclips from the door and automatically retracts to store in the housing unit. Minor assembly. Housing: 33" H x 2 1/2" W. Vinyl barrier: 31" H x 54" W.