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Battery life becomes a genuine consideration here too, since more sophisticated units with additional features tend to draw more power, so checking expected battery longevity before buying can save you a good deal of hassle later on.
When your cat approaches, a sensor within the flap reads the unique code embedded in the microchip cat flaps mechanism and unlocks only for registered pets, keeping stray animals and unwelcome wildlife firmly on the other side of the door.Microchip