CAT FLAP WITH DETECTION OF: This cat flap is battery operated and compatible with the most common microchips. It can program up to 40 different chips and cats 4 LOCKOUT OPTIONS: The white button allows these options: inside only, outside only, inside and outside and fully locked DIMENSIONS: Suitable for animals up to 7 kg. Installation adapter and extension tunnel available separately INSTALLATION: Can be made on wooden doors. A mounting adapter will be required for PVC doors, walls and glass + window doors