Customise your pets access in and out of your home, up to 20 pets can use this collar key access system. Selective entry and exit via the passport key. Easy programming via the navigation panel on dog door or connection to PC. Access modes include, in/out, in only, out only, and a timer mode for each pet. The reinforced lock provides increased strength and push through resistance. Plastic. Suitable for small to medium sized cats and dogs up to 22kgs/50lbs. 4-way lock: in/out/opened/locked. Manual locking system. Suitable for: glass, wood and most types of PVC doors. Can be fitted into windows. H51, W36, D10.5cm. Manufacturers 3 year guarantee.