PetSafe Staywell Add-a-Cat Extra Infrared Key Collar, Yellow Has a manual four-way security lock: allows in only, out only, open, or locked positions. Universal fitting adapts for metal and wood doors, screen doors, walls, sliding doors, and patio doo Simple to fit and easy to use. Fitting instructions and screws included. Dog door has weather-resistant magnetic flap and cover for improved energy efficiency. White cat doo The large dog door has an on/off switch to save battery power when the door is not in use.