Product DescriptionDescriptionLet your cat pass through any interior doorGive your cat the freedom to come and go as he or she pleases with this cat flap thathas a 4 way locking system.Also suitable for small pet,like cat and dogs. Specifications: Size SEntire flap including frame: 22L x 19.9W x 2.2H (cm) (8L x 7.68W x 0.88H Inch)Actual flap: 15.5L x 15W (cm) (6L x 6W Inch) Size MEntire flap including frame: 22.3L x 19.2W x 5.5H(cm) (8L x 7.68W x 2.2H Inch)Actual flap: 15.5L x 15W (cm) (6L x 6W Inch) Size LEntire flap including frame: 25L x 23.5W x 5.5Hcm (10L x 9.4Wx2.2H Inch)Actual flap: 19.5L x 17W (cm) (7.8Lx6.8Winch) Material: Plastic Slide the locks on the bottom of the flap to set the door to one of the following: 1.Flap is locked from both sides2.Flap is completely open and cat can come and go at will3.Cat can only enter from the outside but not go out again4.Cat can go out but can not get back in (for preventing other cats also entering) Operation:1, Red button remove to right and blue button remove to left, then flap is unlock. Cat could in and out.2, Red button remove to left and blue button remote to left, cat only enter and cannot out.3, Red button remote to left and blue button remote to right, cat cannot enter and out4, Red button remove to right and blue button remove to right, cat only out and cannot in.