Safe Fresh-Air Balcony: Turn an open window into a protected hangout with this backless window cat box, plus 0.5mm wire net that blocks unwanted guests while reducing escape and outside stress for calmer sunbathing and bird-watching. Reinforced Stability: Designed for wall installation, the window catio includes L-shaped angle metal and expansion screws, plus three brackets, helping resist jumping impact and wind so your cat plays confidently while you feel steady comfort. 2-Level Dream Haven: Measuring 39.4"" x 20.5"" x 54.7"", and added 2 large doors, so feeding, cleaning, and cuddles are a breeze. Connects with other outdoor catio to build a massive, safe outdoor playground for 1-2 cats. Weather-Ready Materials: Give your cat a year-round lookout with a waterproof felt roof and water-painted boards for outdoor use. The outdoor cat house handles sun and rain, so you can leave it in place and enjoy a low-maintenance routine. Setup is a Snap: Designed for effortless assembly.