A cat flap with a magnetic key which attaches to the collar ensuring that the only cat you allowing to enter is your own! The outside size of this flap is 22.5 x 25.2 x 10.4cm. The door size is 14.8 x 14.5cm. Thanks to its design, the Swing 7 can fit any door (e.g. wooden, metal, glass, walls or screens), it has a 4 way locking system (access only; exit only; access and exit; close), a last in or out direction indicator to ascertain if your animal is indoors or outdoors and a gentle controlled closure. Comes with free magnetic collar.