This battery operated cat flap is compatible with the most common fleas. It can program up to 40 different fleas and cats 4 locking options: the white button allows the following options: internal only, external only, internal and external and full locking Size: The frame size is 25.5cm × 24.5cm × 5.2cm, suitable for pets under 7kg. Installation adapter and extension tunnel are supplied separately Installation: Can be done on the wooden door. PVC doors, walls and glass + yard doors require the installation of adapters Features: It can be installed on the wooden door. The high performance ABS door frame is combined with the PC door leaf, which is durable. Install according to the custom version, which is simple and convenient. Four shapes, in line with the daily habits of cats!