This replacement or extra Passport Key works with the Passport Pet Door. Add an additional pet who can use the door or replace your original Passport Key if you've lost it. Worn on your pet's collar, the Passport Key uses radio-frequency identification (RFID) technology by using a unique code to signal the Passport to operate as programmed for your pet. When your pet gets near the door, the door recognizes your pet and his access settings. The Passport Key is about the size of a bottle cap and doesn't need any batteries. Each Passport Door can program up to 20 Passport Keys.
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