4 WAY SWITCHING MODE --- The cat flap can be set via the tab switches on the door to 4 modes: exit only, entry only, entry and exit and fully locked entry and exit control of your pet. DIMENSIONS AND APPLICATION --- External dimensions: 37cm x 43cm x 1.8cm (W x H x D), Internal Dimensions: 31cm x 37cm (W x H), suitable for small, medium and large dogs and cats with a waist circumference of less than 97.28cm. AUTO LOCKING AND LOCKING --- Pet door with magnetic flap closure , the built-in magnet can keep the door closed automatically when your cat or dog goes outside. EASY TO INSTALL --- Full instructions are included allowing you to easily install it on doors, panels and patios or any other screen area, etc. EXCELLENT QUALITY --- The frame of our cat flap is made of high quality ABS material, the wire of the net is made of expensive materials, and it is strong and durable.