The PetSafe Passport Rechargeable Battery and Passport Key both work with the Passport Pet Access Smart System. The rechargeable battery can be used for full operation of the Passport or as a battery back-up option in case of a power loss. 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.
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