Features:Let your cat pass through each internal doorGive your cat to come and go, the freedom, as he or she pleases with this cat flap that has a 4-way locking systemAlso suitable for small dogsThe doubleflap provides weatherproofing and labor saving fuctions, and a slidein closing panel adds additional insulation when your pet is not using it.This doityourself project easily installs in all types of interior and exterior wall. Specifications:Color whiteMaterial: PlasticSize L: Entire flap including frame: 23.5 * 25.2 * 5.5cmThe actual flap: 19 * 18 cm4 Ways To Go In And Out Control:1. door is locked from both sides2. flap is completely open and cat can come and go at will3. Cat can only penetrate from the outside, but do not go back4. 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