Adjustable cat flap lets you set exactly how you want your cat to use it. Unique four way locking system allows you to let your cat in but not out out but not in stay fully open or stay fully locked. Tunnel design is easy to install and accommodates cats up to 12 lb. For interior use only. Dimensions (L x W x H): 9 in x 2.25 in x 7.75 in .