"" This cat flap is specially designed for medium-sized puppies. With 2 sliding blocks, it Features 4 modes including only in, out only, in and out and fully locked, allowing easy access control of pets. In addition, its ferromagnetic hooking helps achieve automatic closing. Made of high quality ABS, this door is durable. If you want a pet door for your fur friend, come and try it. features: EASY LOCKING: The door has 4 modes by switching the 2 sliding blocks: IN only, Out only, both In and Out and fully locked. It is very easy to control and give your pet the freedom to come and go. FERROMAGNETIC SNAP: There is a ferromagnetic snap. Once your pet has crossed the door, it will close automatically. HIGH QUALITY AND DURABLE: the frame is made of high quality ABS plastic and long lasting, while the frosted textured plastic flap allows pets to see through the door. CONSIDERATE DETAILS: The inside edge of the frame is polished so as not to injure the cat. The screw reinforcement to avoid