1、Let your cat pass through each internal door 2、Give your cat to come and go, the freedom, as he or she pleases with this cat flap that has a 4-way locking system 3、Also suitable for small dogs 4、The double-flap provides weatherproofing and labor saving fuctions, and a slide-in closing panel adds additional insulation when your pet is not using it. 5、This do-it-yourself project easily installs in all types of interior and exterior wall. Features: Let your cat pass through each internal door Give your cat to come and go, the freedom, as he or she pleases with this cat flap that has a 4-way locking system Also suitable for small dogs   Specifications: Color white Material: Plastic Size S: Entire flap including frame: 19.2 * 20 * 2.5cm The actual flap: 15.6 * 15.2 cm 4 Ways To Go In And Out Control: 1. door is locked from both sides 2. flap is completely open and cat can come and go at will 3. Cat can only penetrate from the outside, but do not go back 4. Cat can go out but not go back (to other cats also prevents entry) Surgery: 1. Remove red button to the right and blue button to the left door will unlock. Cat can go out and get. 2. Remove red button to the left and blue button to the left, Cat can only enter and not go out. 3. Remove red buttons to the left and blue buttons to the right cat can not enter and go out 4. Remove red button to the right and blue button remove only to the right, remove cat and can not go back. Package List: 1 x 4 Wage cat flap