The Passport Key from PetSafe works with the Passport Pet Access Smart System and can be used for an additional pet using the Passport or as a replacement if your pet's Passport Key is lost. Worn on your pet's collar, the Passport Key uses radio-frequency identification technology by using a unique code to signal the Passport to operate as programmed for your pet. The Passport Key is about the size of a quarter and requires no batteries. Each Passport can program up to 20 Passport Key accessories.
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