Designed for large cats and small dogs, the Microchip Pet Door uses your pets existing microchip as an electronic door key and keeps out intruder animals. The curfew mode lets you set a lock and unlock time; ideal if you want to keep your pets inside at night. Mounting adaptor required for glass installations. Flap Size W178mm, H170mm and the below dimensions are the hole size. Made from plastic. Suitable for medium to large sized cat and small dog . In/out/opened/locked. Max shoulder width 17cm. Suitable for: glass, wood and most types of PVC doors. Can be fitted into windows. H17, W17.8, D7cm. Manufacturers 3 year guarantee.