Let your furry friends come and go with the PetSafe® Electronic SmartDoor™. Never worry about uninvited guests sneaking in because the flap only locks and unlocks when it senses the SmartKey™ on your pet’s ID collar. Easily program your pet’s entry and exit with the automatic setting. You can also set the door to be fully locked or fully unlocked. The SmartDoor™ is great for multi-pet households because it works with up to 5 different SmartKeys™ that you can customize for each pet (one programmed SmartKey™ is included). Installation is a simple do-it-yourself project. The door fits into standard-size paneled, wood, metal and PVC doors 1 ½ - 2 inches thick. Once installed you can program the electronic door in minutes. PetSafe® brand is here to help you and your pet live happy together®.